C1506–LEFT FRONT TIRE PRESSURE TRIGGER MODULE PERFORMANCE

For a complete wiring diagram Refer to Section 8W

Theory of Operation

The Tire Pressure Trigger Module is used to automatically learn the location of each wheel sensor on the vehicle. The module is controlled and activated in sequence by the Wireless Control Module (SKREEM) over a LIN bus. When activated, the module will generate a 125 KHz signal of sufficient field strength to trigger the tire pressure sensor and force a RF transmission from the sensor.

• When Monitored:

  Continuously.

• Set Condition:

  The WCM (SKREEM) will monitor the messages from each Tire Pressure Trigger Module over the LIN bus. If any of the messages are not received, or are received other than as expected, a DTC will set. When the condition is corrected, or is no longer detected, as acknowledged via a LIN bus message, the WCM will reset the appropriate trigger module fault status.

Diagnostic Test

NOTE: If the incorrect Placard Values were programmed into the WCM/SKREEM, a DTC could be set. Before continuing with any TPM diagnostic test, using the scan tool, check that the correct Placard Values have been programmed in to the module.

• Go to 2

• Go to 9

NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.

• Go to 3

• Repair the (F924) Fused Ignition Switch Output (Run) circuit for an open circuit or high resistance.
• Perform SKREEM VERIFICATION TEST. (Refer to 8 - ELECTRICAL/VEHICLE THEFT SECURITY - STANDARD PROCEDURE)

NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.

• Go to 4

• Repair the (Z924) Ground circuit(s) for an open circuit or high resistance.
• Perform SKREEM VERIFICATION TEST. (Refer to 8 - ELECTRICAL/VEHICLE THEFT SECURITY - STANDARD PROCEDURE)

• Repair the (D508) COM - LIN Tire Pressure Monitor LAN circuit for a short to voltage.

• Go to 5
• Perform SKREEM VERIFICATION TEST. (Refer to 8 - ELECTRICAL/VEHICLE THEFT SECURITY - STANDARD PROCEDURE)

• Repair the (D508) COM - LIN Tire Pressure Monitor LAN circuit for a short to ground.
• Perform SKREEM VERIFICATION TEST. (Refer to 8 - ELECTRICAL/VEHICLE THEFT SECURITY - STANDARD PROCEDURE)

• Go to 6

NOTE: The test light should be illuminated and bright. Compared the brightness to that of a direct connection to the battery.

• Go to 7

• Repair the (D508) COM - LIN Tire Pressure Monitor LAN circuit for an open circuit or high resistance.
• Perform SKREEM VERIFICATION TEST. (Refer to 8 - ELECTRICAL/VEHICLE THEFT SECURITY - STANDARD PROCEDURE)

• Go to 8

• Test Complete.
• Perform SKREEM VERIFICATION TEST. (Refer to 8 - ELECTRICAL/VEHICLE THEFT SECURITY - STANDARD PROCEDURE)

• Replace the Wireless Control Module (SKREEM) in accordance with the Service Information.
• Perform SKREEM VERIFICATION TEST. (Refer to 8 - ELECTRICAL/VEHICLE THEFT SECURITY - STANDARD PROCEDURE)

• Return to the first step of this test and perform the diagnostic procedure.

• Test complete.