2010 Cadillac Truck SRX FWD V6-3.0L Page 863

2010 Cadillac Truck SRX FWD V6-3.0L Page 863

Circuit/System Description

The tire pressure monitor (TPM) system has a radio frequency (RF) transmitting pressure sensor in each wheel/tire assembly. As vehicle speed

increases, centrifugal force closes the sensors internal roll switch, which puts the sensor into Rolling mode. The body control module (BCM)

receives and translates the data contained in the tire pressure sensor RF transmissions into sensor presence, sensor mode, and tire pressure. Once

vehicle speed is greater than 40km/h (25 mph), the BCM waits for the first sensor to go into Rolling mode, then checks if all sensors have gone into

Rolling mode. If one or more sensors do not go into these modes, or do not transmit at all, the BCM will set DTC C0750, C0755, C0760, or C0765

respectively.

Conditions for Running the DTC

Vehicle speed is greater than 40 km/h (25 mph).

Conditions for Setting the DTC

* A sensor does not transmit for 18 minutes.

* A sensor low battery condition.

Action Taken When the DTC Sets

* The tire pressure monitor indicator icon on the instrument panel cluster (IPC) flashes for 1 minute and then remains illuminated after the

ignition switch is cycled ON and the IPC bulb check is complete.

* If equipped, the driver information center (DIC) displays the suspect tire pressure as dashes.

* If equipped, the DIC displays a service tire monitor type message.

Conditions for Clearing the DTC

* A current DTC will clear when the malfunction is no longer present and 1 ignition cycle occurs.

* The BCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids

* Some aftermarket wheel valve stem holes are located further from the wheel rim than original equipment wheels. When using the TPM

special tool to activate a sensor, ensure the tool antenna is no further than 15 cm (6 in) from the sensor and is aiming upward.

* Aftermarket wheel valve stem locations can cause a sensor to not function correctly.

* A sensor may have been damaged due to a previous wheel/tire service or flat tire event.

* The use of other than GM approved tire sealants can obstruct the sensor pressure sensing port and cause inaccurate tire pressure readings. If

this condition is verified, remove the sealer from the tire and replace the sensor. Refer to Tire Pressure Indicator Sensor Replacement (See:

Instrument Panel, Gauges and Warning Indicators/Tire Monitoring System/Tire Pressure Sensor/Service and Repair).

* Occasionally sensor transmissions are not received by the BCM due to vehicle level RF interference from items such as but not limited to

aftermarket ignition systems, DVD players, CB radios, or metallic type window tinting.

* The sensor activation procedure may have to be repeated up to 3 times before determining a sensor is malfunctioning. In the event a

particular sensor information is displayed on the special tool upon activation but the horn does not chirp, it may be necessary to rotate the

wheel valve stem to a different position due to the RF signal is being blocked by another component.

* Occasionally sensors can become mislocated due to previous tire rotations where the sensor learn procedure was not performed or stray

sensor transmissions have been received from other vehicles. Always learn the sensors to ensure the DTC set is for that actual physical corner

of the vehicle. Refer to Tire Pressure Indicator Sensor Learn (See: Instrument Panel, Gauges and Warning Indicators/Tire Monitoring

System/Tire Pressure Sensor/Testing and Inspection).

* A sensor low battery condition will set a sensor DTC but will not illuminate the low tire pressure indicator or display a message on the DIC,

if equipped. The sensor battery condition can be verified in the scan tool BCM data list. If a sensor low battery condition is indicated on the

scan tool, the sensor will need to be replaced. Refer to Tire Pressure Indicator Sensor Replacement (See: Instrument Panel, Gauges and

Warning Indicators/Tire Monitoring System/Tire Pressure Sensor/Service and Repair).

Reference Information

Description and Operation

Tire Pressure Monitor Description and Operation (See: Instrument Panel, Gauges and Warning Indicators/Tire Monitoring System/Description

and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)