GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2004 🢒 SRX 🢒 Suspension 🢒 Tire Pressure Monitoring 🢒 DTC C0750, C0755, C0760, or C0765

Circuit Description

The tire pressure monitor (TPM) system has a radio frequency (RF) transmitting pressure sensor inside each wheel/tire assembly. As vehicle speed increases, centrifugal force closes the sensors internal roll switch which puts the sensors into drive mode. The driver antenna module receives and translates the data contained in each sensor's RF transmission into sensor presence, sensor mode, and tire pressure. Once vehicle speed is 32 km/h (20 mph), or greater, the driver antenna module waits for the first sensor to go into drive mode then checks if all sensors have gone into drive mode.

Conditions for Running the DTC

Vehicle speed is 32 km/h (20 mph), or greater.

Conditions for Setting the DTC

Any given sensor does not go into drive mode, or does not transmit at all for 10 minutes.

Action Taken When the DTC Sets
    • A DTC is stored in memory.
    • The DIC displays the SERVICE TIRE MONITOR warring message.
    • The DIC displays the suspect tire pressure as dashes.

Conditions for Clearing the DTC
    • A current DTC will clear when the malfunction is no longer present.
    • A history DTC will clear after 100 consecutive malfunction free ignition cycles.
    • Using a scan tool

Diagnostic Aids
    • Some aftermarket wheel valve stem holes are located further from the wheel rim than the original equipment wheels. When using the J-46079 TPM tool to activate a sensor, ensure the tool's antenna is no further than 15 cm (6 in) from the sensor.
    • The sensor activation procedure using the TPM diagnostic tool may have to be repeated up to 3 times before determining a sensor is malfunctioning.
    • The tire pressure sensors transmit on the AM band and are received by the driver antenna module thorough the RFA antenna grid in the vehicle's driver side rear ¼ window. Ensure the RFA antenna system is operating to specifications, refer to Diagnostic System Check - Remote Keyless Entry in Keyless Entry.
    • Occasionally sensors can become mislocated due to previous tire rotations where the sensor learn procedure was not performed. Always learn the sensors to ensure the DTC set is for that actual physical corner of the vehicle. Refer to Tire Pressure Sensor Learn .
    • Occasionally sensor transmissions are not received by the driver antenna module due to vehicle level RF interference.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. Tests if the sensors will transmit valid data with good signal strength in response to a low frequency activation. During this step it is important to observe the signal strength graph on the TPM tool's display screen after the activate button has been pressed and released. Any more than 1/4 graph displayed can be considered good signal strength.

    2.

  2. Tests if any sensors are mislocated.

    3.

  3. Tests if the driver antenna module can receive and translate data from simulated sensor transmissions.

    4.

  4. Tests if the sensors internal roll switch is functioning properly.

Step

Action

Values

Yes

No

Schematic Reference: Tire Pressure Monitoring System Schematics

1

Did you perform the Tire Pressure Monitor Diagnostic System Check?

 

Go to Step 2

Go to Diagnostic System Check - Tire Pressure Monitoring

2

Using the J-46079 TPM tool, activate each tire pressure sensor and record each sensor's transmission data on the repair order.

Does the TPM tool display each sensor's transmission data as specified?

8 digit ID number, accurate tire pressure +/- 2 psi, Learn Mode, Good Signal Strength

Go to Step 3

Go to Step 7

3
  1. Install a scan tool.
  2. Turn the ignition ON, with the engine OFF.
  3. With the scan tool, observe all 4 sensor Ids and their locations.

Do the Ids and their locations displayed on the scan tool match the Ids and locations recorded on the repair order?

 

Go to Step 4

Go to Step 5

4
  1. Enable the TPM learn mode. Refer to Tire Pressure Sensor Learn .
  2. Using the TPM tool in simulate mode, learn 4 simulated sensor transmissions into the driver antenna module's memory.
  3. With the scan tool observe all 4 sensor locations, Ids and tire pressures.

Does the scan tool display all 4 sensor locations, Ids and tire pressures as specified?

LF Pressure Sensor ID-123401/LF Tire Pressure-10 psi, RF Pressure Sensor ID-123402/RF Tire Pressure-20 psi, RR Pressure Sensor ID-123403/RR Tire Pressure-30 psi, LR Pressure Sensor ID-123404/LR Tire Pressure-40 psi +/- 2 psi

Go to Step 5

Go to Step 8

5

Learn the tire pressure sensors. Refer to Tire Pressure Sensor Learn .

Did you complete the procedure?

 

Go to Step 6

--

6
  1. Test drive the vehicle above 40 km/h (25 mph) for at least 10 seconds.
  2. With the scan tool, observe the suspect Pressure Sensor Mode data parameter.

Does the scan tool display that the suspect Pressure Sensor Mode changes from Wake to Drive?

 

System OK

Go to Step 7

7

Replace the suspect sensor. Refer to Tire Pressure Indicator Sensor Replacement .

Did you complete the replacement?

 

Go to Step 9

-

8

Replace the driver antenna module. Refer to Radio Antenna Module Replacement In Entertainment.

Did you complete the replacement?

 

Go to Step 9

-

9
  1. Use the scan tool in order to clear the DTC.
  2. Operate the vehicle within the conditions for running and setting the DTC.

does the DTC reset?

 

Go to Step 2

System OK