CAUTION 2: Tire pressure sensor valve stem caps and cores are specially designed for the sensors. Due to risk of corrosion, do not use a standard valve stem cap or core in a tire pressure sensor in place of the original equipment style sensor cap and core.

CAUTION 3: Do not attempt to install a tire pressure sensor in an aftermarket wheel. Use tire pressure sensors in original style factory wheels only.

CAUTION 4: Any time a sensor is to be installed in a wheel, a new seal and washer must be installed on the stem to ensure air tight sealing.

NOTE: TPM thresholds have been established for the original tire size equipped on the vehicle. Use original size tires only to maintain system accuracy.

NOTE: The 315MHz sensors will not work in the 433MHz system, and will cause a system malfunction warning in the Tire Pressure Monitoring System. Also, the dealer TPM/RKE Analyzer tool will not read the sensors if set to the improper year. It is very important to be sure to use the correct part number when replacing sensors, and to set the TPM/RKE Analyzer tool to the proper vehicle and model year.

Part numbers in Red text are the latest revisions and what is recommended for replacement. Part numbers are current as of April, 2016.

68001696AB (includes 56053030AC sensor, nut and cap)
superseded by
68078861AB (includes 56029479AB sensor, nut and cap)

56053036AA (includes sensor and cap)
superseded by
56029465AB (includes sensor and cap)
superseded by
56029465AC (includes sensor and cap)
superseded by
56029479AB (includes sensor and cap)

68001696AB (includes 56053030AC sensor, nut and cap)
superseded by
68078861AB (includes 56029479AB sensor, nut and cap)

56029359AC (includes sensor and cap)
superseded by
56029481AB (includes sensor and cap)

68001698AB (includes 56053031AD sensor and cap)
superseded by:
68078768AB (includes sensor and cap)

The Tire Pressure Monitor System (TPM) system uses wireless technology with wheel rim mounted electronic sensors to monitor tire pressure levels. Sensors, mounted to each wheel as part of the valve stem, transmit tire pressure readings to the Receiver Module.

The "Tire Pressure Monitoring Indicator Lamp" will illuminate in the instrument cluster, and an audible chime will be activated when one or more tire pressures is low. The "Tire Pressure Monitoring Indicator Lamp" will flash on and off for ten seconds when a system fault is detected. The flash cycle will repeat every ten minutes or until the fault condition is removed and reset.

The base Tire Pressure Monitoring System consists of the following components:

• Receiver Module
• 4 (or 5*) Wheel Sensors
• Amber Colored Tire Pressure Monitoring Indicator Lamp

*A sensor is located in the spare wheel if the vehicle is equipped with a matching full size spare wheel and tire assembly.

Base system operation

The tire pressure monitoring system is designed to operate without loss of function for all types of standard tire constructions. (Function with different types of run flat tire constructions needs to be evaluated for each design). The wheel sensor shall monitor tire pressure, air temperature inside the tire, wheel acceleration and the sensor internal battery status for all four active road tires. The sensor will broadcast this information, along with a unique 32 bit ID, to a central receiver circuit located inside the WCM. The information received by the WCM will be decoded and stored in memory (RAM) in the WCM. If a "warning" or "fault" condition exists, the WCM will send a bus message request to illuminate the amber colored indicator lamp and to sound the chime.

If the WCM detects a warning or fault condition at ignition key "on" it will wait ten seconds +/- 10 % before sending the first request to illuminate the Indicator Lamp. This will assure that the display module has concluded its bulb check period. The display module will request a chime once per ignition cycle for each "warning" or "fault" condition detected. A "warning" or "fault" condition will remain enabled until the problem causing the condition is corrected and removed/reset.

The WCM shall continuously monitor for the receipt of tire pressure RF message transmissions from the wheel sensors during both the ignition key "on" and key "off" cycles. The wheel sensor ID's and the location of each sensor (e.g. Tire 1, Tire 2 etc.) are stored in the WCM non-volatile memory during the initial Manufacturing Plant Process, or during a service procedure, as required. The recommended "placard pressure", "low-pressure threshold" and "Hysteresis Pressure Values" for the tires installed on the vehicle, are stored in the WCM non-volatile memory during the initial Manufacturing Plant Process, or during a service procedure, as required.

The TPM System will continue to warn the driver of low tire pressure as long as the condition exists, and will not turn off the indicator lamp until the tire pressure is at or above the Low Pressure (lamp) OFF threshold (see placard table below). The system will automatically update and the TPM warning lamp will extinguish once the updated tire pressures have been received.

The tire pressure will vary with temperature by about 1 psi (6.9 kPa) for every 12°F (6.5°C). This means that when the outside temperature decreases, the tire pressure will decrease. Tire pressure should always be set based on cold inflation tire pressure (placard pressure). This is defined as the tire pressure after a vehicle has not been driven for more than 3 hours - and in outside ambient temperature. The tire pressure will also increase as the vehicle is driven - this is normal and there should be no adjustment for this increased pressure. For a system fault, the system will return to normal once the WCM receives a valid transmission from that sensor location.

Base system monitoring

This system will consist of Tire Pressure Monitoring (TPM) sensors attached to each wheel through the valve stem mounting hole, a Wireless Control Module (WCM) and a yellow TPM telltale lamp. A TPM sensor shall be installed in the spare wheel if the vehicle is equipped with a matching full size spare wheel and tire assembly.

Sensor learning mode

Each sensor's (transmitter) broadcast is uniquely coded so that the wireless control module (WCM) can monitor the state of each of the sensors on the four rotating road wheels. The WCM can automatically learn and store the sensor's ID while driving within 10 minutes continuously above 15 m.p.h. (24 Km/h) after a sensor has been replaced, the vehicle must be stationary for more than 20 minutes in order to initiate the learning sequence.

Spare tire sensor programming

On vehicles equipped with a Tire Pressure Monitoring System (TPMS), when the spare tire pressure sensor is replaced with a new pressure sensor, a diagnostic scan tool MUST be used to run a routine that will program the new pressure sensor ID into the Wireless Control Module (WCM), commonly referred to as the Sentry Key Remote Entry Module (SKREEM). Please copy the ID number off of the new pressure sensor before installing it into the spare tire. Then follow the programming steps outlined in the diagnostic scan tool for: 'Learn Spare Tire Sensor ID' under 'Miscellaneous Functions' for the 'WCM/Wireless Control Module' menu item as appropriate.

If replacing the WCM, the spare tire must be dismounted from its wheel to access and note the spare tire pressure sensor ID. Then follow the programming steps outlined in the diagnostic scan tool for 'Learn Spare Tire Sensor ID' under 'Miscellaneous Functions' for the 'WCM/Wireless Control Module' menu item as appropriate. In addition, the placard pressure thresholds must be updated in the new WCM. Go to "Update Pressure Thresholds" under "Miscellaneous Functions" for the "WCM Wireless Control Module" and follow the procedure.

Transponder

Transponders located in three of the four wheel wells of the vehicle to provide the Wireless Control Module (WCM) located in the Sentry Key Remote Entry Module (SRKEEM) with the location of the tire pressure sensors on the vehicle. The transponders are located in the left front, right front and right rear wheel wells. A fourth transponder is not necessary in the remaining wheel well due to the process-of-elimination theory. Once the system knows the location of the first three sensors it assumes the location of the fourth tire pressure sensor is in the left rear tire.

Notes and cautions

NOTE 1: It is particularly important, for you to check the tire pressure in all of your tires regularly and to maintain the proper pressure.

NOTE 2: For vehicles with optional wheel/tire sizes and significantly different tire placard pressures, the placard pressure value and the low-pressure threshold value is re-programmable at your authorized dealer to accommodate the customer selected wheel/tire combinations recommended by DaimlerChrysler Corporation.

NOTE 3:

• The TPM system can inform the driver of a low tire pressure condition.
• The TPM system is not intended to replace normal tire care and maintenance, nor to provide warning of a tire failure or condition.
• The TPM system should not be used as a tire pressure gauge while adjusting your tire pressure.

The Tire Pressure Monitor System (TPM) system uses wireless technology with wheel rim mounted electronic sensors to monitor tire pressure levels. Sensors mounted to each wheel as part of the valve stem transmit tire pressure readings to the Receiver Module. The wheel sensors monitor tire pressure, and status for all four active road tires and the spare tire. The spare tire pressure is monitored, but not displayed.

The "Tire Pressure Monitoring Indicator Lamp" will illuminate in the instrument cluster, and an audible chime will be activated when one or more tire pressures is low. The "Tire Pressure Monitoring Indicator Lamp" will flash on and off for ten seconds when a system fault is detected. The flash cycle will repeat every ten minutes or until the fault condition is removed and reset.

The Premium Tire Pressure Monitoring System consists of the following components:

• Receiver Module
• 4 (or 5*) Wheel Sensors
• 3 Wheel Sensor Trigger Modules
• Tire Pressure Monitoring System Display Messages in the EVIC
• Amber Colored Tire Pressure Monitoring Indicator Lamp

*A sensor is installed in the spare wheel if the vehicle is equipped with a matching full size spare wheel and tire assembly.

Premium system operation

The tire pressure monitoring system is designed to operate without loss of function for all types of standard tire constructions. (Function with different types of run flat tire constructions needs to be evaluated for each design). The wheel sensor shall monitor tire pressure, air temperature inside the tire, wheel acceleration and the sensor internal battery status for all four active road tires and the spare tire, if so equipped. The sensor will broadcast this information, along with a unique 32 bit ID, to a central receiver circuit located inside the WCM. The information received by the WCM will be decoded and stored in (RAM) memory in the WCM. The WCM will send bus messages to the re-configurable display module to display the pressures of the four active road tires in vehicle position. The spare tire pressure is monitored but it is not displayed.

If a "warning" or "fault" condition exists, the WCM will send a bus message request to display the text messages and, when required, illuminate the amber colored ISO Indicator Lamp. "Warnings" and "faults" are described in more detail below. If the WCM detects a warning or fault condition at ignition key "on" it will wait ten seconds +/- 10% before sending the first request to illuminate the Indicator Lamp and to display the text messages. This will assure that the display module has concluded its bulb check period. The display module will request a chime once per ignition cycle for each "warning" or "fault" condition detected. A "warning" or "fault" condition will remain enabled until the problem causing the condition is corrected and removed/reset.

The WCM shall continuously monitor for the receipt of tire pressure RF message transmissions from the wheel sensors during both the ignition key "on" and key "off" cycles. The wheel sensor ID's and the location of each sensor (e.g. Left Front, Right Front etc.) are stored in the WCM non-volatile memory during the initial Manufacturing Plant Process, or during a service procedure, as required. The recommended "placard pressure", "low-pressure threshold" and Hysteresis Pressure Values for the tires installed on the vehicle, are stored in the WCM non-volatile memory during the initial Manufacturing Plant Process, as described later in this document or during a service procedure as required.

The TPM System will continue to warn the driver of low tire pressure as long as the condition exists, and will not turn off the indicator lamp until the tire pressure is at or above the Low Pressure (lamp) OFF threshold (see placard table below). The system will automatically update and the TPM warning lamp will extinguish once the updated tire pressures have been received.

The tire pressure will vary with temperature by about 1 psi (6.9 kPa) for every 12°F (6.5°C). This means that when the outside temperature decreases, the tire pressure will decrease. Tire pressure should always be set based on cold inflation tire pressure (placard pressure). This is defined as the tire pressure after a vehicle has not been driven for more than 3 hours - and in outside ambient temperature. The tire pressure will also increase as the vehicle is driven - this is normal and there should be no adjustment for this increased pressure. For a system fault, the system will return to normal once the WCM receives a valid transmission from that sensor location.

Premium system monitoring

The operation and lamp/chime strategy for a premium tire pressure monitoring system (TPMS) is the same as the base TPMS, but the premium TPMS can display text messages and a graphic display of the tire pressure on the information cluster. If a low pressure condition is detected, in addition to a chime and the indicator lamp turning ON, a low pressure text message indicating which tire is low will be displayed in the instrument cluster for 3 seconds. This text message will be followed by a graphic display of the pressure value(s) with the low tire(s) flashing. Once pressure in the suspect tire raises above the Low Pressure (lamp) OFF Threshold, the lamp will go out and the system returns to normal within approximately two minutes time. If a system fault is detected, in addition to the flashing lamp, a "Service Tire Press.System" text message will be displayed in the instrument cluster, and the graphic display will have "- -" in place of the pressure value. The system will return to normal once the WCM receives a valid transmission from that sensor location.

A Premium Tire Pressure Monitoring System (TPMS) determines the location of the tire pressure sensors by using transponders located in three of the four wheel wells on the vehicle. A fourth transponder is not necessary in the remaining wheel well due to the process of elimination theory. Once the system knows the location of the first three sensors, it assumes the location of the fourth tire pressure sensor, and update the graphic display when necessary.

For both the premium and base TPMS, the recommended "Placard Pressure", "Low-pressure Threshold" and "Hysteresis Pressure Values" for the tires installed on the vehicle, are stored in the WCM non-volatile memory during the initial Manufacturing Plant Process, or during a service procedure, as required. To determine the pressure thresholds for a vehicle, refer to the Tire Inflation Pressure (Placard) Label, and then apply the placard pressure to the following table. The Low Pressure OFF Threshold is defined as the Low Pressure ON Threshold plus the Hysteresis Pressure Value.

Sensor learning mode

Each sensor's (transmitter) broadcast is uniquely coded so that the wireless control module (WCM) can monitor the state of each of the sensors on the four rotating road wheels. The WCM can automatically learn and store the sensor's ID while driving within 10 minutes continuously above 15 m.p.h. (24 Km/h) after a sensor has been replaced, the vehicle must be stationary for more than 20 minutes in order to initiate the learning sequence.

Spare tire sensor programming

On vehicles equipped with a Tire Pressure Monitoring System (TPMS), when the spare tire pressure sensor is replaced with a new pressure sensor, a diagnostic scan tool MUST be used to run a routine that will program the new pressure sensor ID into the Wireless Control Module (WCM), commonly referred to as the Sentry Key Remote Entry Module (SKREEM). Please copy the ID number off of the new pressure sensor before installing it into the spare tire. Then follow the programming steps outlined in the diagnostic scan tool for: "Learn Spare Tire Sensor ID" under "Miscellaneous Functions" for the "WCM/Wireless Control Module" menu item as appropriate.

If replacing the WCM, the spare tire must be dismounted from its wheel to access and note the spare tire pressure sensor ID. Then follow the programming steps outlined in the diagnostic scan tool for "Learn Spare Tire Sensor ID" under "Miscellaneous Functions" for the "WCM/Wireless Control Module" menu item as appropriate. In addition, the placard pressure thresholds must be updated in the new WCM. Go to "Update Pressure Thresholds" under "Miscellaneous Functions" for the "WCM Wireless Control Module" and follow the procedure.

Transponder

Transponders located in three of the four wheel wells of the vehicle to provide the Wireless Control Module (WCM) located in the Sentry Key Remote Entry Module (SRKEEM) with the location of the tire pressure sensors on the vehicle. The transponders are located in the left front, right front and right rear wheel wells. A fourth transponder is not necessary in the remaining wheel well due to the process-of-elimination theory. Once the system knows the location of the first three sensors it assumes the location of the fourth tire pressure sensor is in the left rear tire.

Notes and cautions

NOTE 1: For vehicles with optional wheel/tire sizes and significantly different tire placard pressures, the placard pressure value and the low-pressure threshold value is re-programmable at your authorized dealer to accommodate the customer selected wheel/tire combinations recommended by DaimlerChrysler Corporation.

NOTE 2: It is particularly important, for you to check the tire pressure in all of your tires regularly and to maintain the proper pressure.

NOTE 3:

• The TPM system can inform the driver of a low tire pressure condition.
• The TPM system is not intended to replace normal tire care and maintenance, nor to provide warning of a tire failure or condition.
• The TPM system should not be used as a tire pressure gauge while adjusting your tire pressure.

Warning messages

Tire Pressure Monitor System "warnings" will cause a text message to be displayed, an audible chime to sound and the "Tire Pressure Indicator Lamp" to illuminate. The audible chime will occur once every ignition cycle for each "warning" detected. The "Tire Pressure Indicator Lamp" will illuminate continuously (solid) and shall remain illuminated until the warning condition is removed/ reset.

NOTE: The Indicator Lamp will only illuminate for the four active road tires. A low spare tire pressure will not cause the Indicator Lamp to illuminate.

When the appropriate conditions exist, the Electronic Vehicle Information Center (EVIC) displays the following messages:

"LEFT FRONT", "LEFT REAR", "RIGHT FRONT", "RIGHT REAR", "SPARE LOW PRESSURE"

One or more of these messages will be displayed in the EVIC if a low tire pressure condition exists in one or more tires. Inspect all tires for proper inflation pressure, once the proper tire pressure has been set, the TPM system warning will reset automatically when the vehicle has been driven for at least 2 minutes at or above 15 mph (24 km/h).

"CHECK TPM SYSTEM" / "Service Tire Press.System"

See your authorized dealer when this message appears in the EVIC. This message indicates that a system fault condition has been detected.

Unfortunately, upgrading from the base system to the premium system is extremely difficult. Three trigger modules would have to be hard-wired into the wheelwells and the wiring harnesses are not available separately. In addition, programming or replacement of the receiver module would be required, and even then we are not sure if that would be all that is involved to make the system work properly.