2010 Cadillac CTS Sedan AWD V6-3.6L Page 756
- Left Rear Low Tire Pressure Sensor
DTC C0765
- Right Rear Low Tire Pressure Sensor
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 remote control door lock receiver
(RCDLR) 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 RCDLR waits for the sensors to go into rolling mode. If one or more sensors do
not go into rolling mode, or do not transmit at all, the RCDLR will set DTC C0750, C0755, C0760, or C0765 respectively.
Conditions for Running the DTC
Vehicle speed is 40 km/h (25 mph) or greater for 2 minutes.
Conditions for Setting the DTC
A sensor does not transmit for 18 minutes.
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.
* The driver information center (DIC) displays the suspect tire pressure as dashes.
* The DIC displays the 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 key cycle occurs.
* The RCDLR 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 RCDLR 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's 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 (With UH3) (See: Instrument Panel, Gauges and Warning Indicators/Tire
Monitoring System/Tire Pressure Sensor/Testing and Inspection/Tire Pressure Indicator Sensor Learn (With UH3))Tire Pressure Indicator
Sensor Learn (Without UH3) (See: Instrument Panel, Gauges and Warning Indicators/Tire Monitoring System/Tire Pressure Sensor/Testing
and Inspection/Tire Pressure Indicator Sensor Learn (Without UH3)).
* 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 RCDLR 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/Circuit Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit
Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)
