U1116
U1116-LOST COMMUNICATION WITH LEFT REAR TIRE PRESSURE TRIGGER MODULE
For a complete wiring diagram, refer to the Wiring Information Electrical Diagrams.
- When Monitored:
- With the ignition on
- Battery voltage between 10 and 16 volts
- Ignition Off Draw (IOD) fuse installed
- Set Condition:
If the Wireless Control Module (WCM) fails to receive bus messages from the Tire pressure trigger module for two consecutive counts of trigger module not responding to a communication check.
1. DTC STATUS
1. Make sure every trigger module connector is connected.
2. Ignition on, engine not running.
3. With the scan tool, run the "Trigger Module Test Routine" under "Miscellaneous Functions" for the "WCM" and follow the procedure.
NOTE: Three trigger modules are located in three of the four wheel wells on the vehicle to provide the WCM with the location of the tire pressure sensors 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. The locations of the trigger modules can vary for each vehicle. Make sure the vehicle has trigger modules, and that are in the right locations. After every repair, the trigger module test routine must be rerun in order to verify the fix.
Did the Left Front Trigger Module have NO as a result?
Yes
- Go To 2
No
- Perform the appropriate diagnostic procedure.
2. (F202) FUSED IGNITION SWITCH OUTPUT (RUN) CIRCUIT OPEN OR HIGH RESISTANCE
1. Ignition on, engine not running.
2. Using a 12-volt test light connect to ground, check the (F202) Fused Ignition Switch Output (Run) circuit.
NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.
Is the test light illuminated and bright?
Yes
- Go To 3
No
- Repair the (F202) Fused Ignition Switch Output (Run) circuit for an open circuit or high resistance.
- Perform the TPM VERIFICATION TEST. Tire Pressure Monitor (TPM) Verification Test.
3. (Z904) GROUND CIRCUIT(S) OPEN OR HIGH RESISTANCE
1. Using a 12-volt test light connect to 12 volts, check each of the (Z904) Ground circuit(s).
NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.
Is the test light illuminated and bright?
Yes
- Go To 4
No
- Repair the (Z904) Ground circuit(s) for an open circuit or high resistance.
- Perform the TPM VERIFICATION TEST. Tire Pressure Monitor (TPM) Verification Test.
4. (D508) COM - LIN TIRE PRESSURE MONITOR LAN CIRCUIT SHORTED TO VOLTAGE
1. Turn the ignition off.
2. Disconnect all three tire pressure transponder harness connectors.
3. Disconnect the Sentry Key Remote Entry Module harness connector.
4. Ignition on, engine not running.
5. Measure the voltage of the (D508) COM - LIN Tire Pressure Monitor LAN circuit.
Is there any voltage present?
Yes
- Repair the (D508) COM - LIN Tire Pressure Monitor LAN circuit for a short to voltage.
- Perform the TPM VERIFICATION TEST. Tire Pressure Monitor (TPM) Verification Test.
No
- Go To 5
5. (D508) COM - LIN TIRE PRESSURE MONITOR LAN CIRCUIT SHORTED TO GROUND
1. Turn the ignition off.
2. Measure the resistance between ground and the (D508) COM - LIN Tire Pressure Monitor LAN circuit.
Is the resistance below 5.0 Ohms?
Yes
- Repair the (D508) COM - LIN Tire Pressure Monitor LAN circuit for a short to ground.
- Perform the TPM VERIFICATION TEST. Tire Pressure Monitor (TPM) Verification Test.
No
- Go To 6
6. (D508) COM - LIN TIRE PRESSURE MONITOR LAN CIRCUIT OPEN OR HIGH RESISTANCE
1. Use a jumper wire with one end connected to ground and the other to the (D508) COM - LIN Tire Pressure Monitor LAN circuit in the Front Left Pressure Tire Transponder harness connector.
2. Using a 12-Volt test light connected to battery voltage, probe the (D508) COM - LIN Tire Pressure Monitor LAN circuit in the WCM harness connector.
NOTE: The test light should be illuminated and bright. Compared the brightness to that of a direct connection to the battery.
Does the test light illuminate bright?
Yes
- Go To 7
No
- Repair the (D508) COM - LIN Tire Pressure Monitor LAN circuit for an open circuit or high resistance.
- Perform the TPM VERIFICATION TEST. Tire Pressure Monitor (TPM) Verification Test.
7. (D508) COM-LIN TIRE PRESSURE MONITOR LAN CIRCUIT OPEN
1. Turn the ignition off.
2. Disconnect the Tire Pressure Trigger Module.
3. Disconnect the WCM harness connector.
4. With an Ohmmeter measure the resistance of the (D508) COM-LIN Tire Pressure Monitor LAN circuit.
Is the resistance below 5 Ohms?
Yes
- Go To 8
No
- Repair or replace the open circuit.
- Perform the TPM VERIFICATION TEST. Tire Pressure Monitor (TPM) Verification Test.
8. POWER AND GROUND CIRCUIT OPEN
1. Ignition on, engine not running.
2. With a voltmeter measure the voltage between the power and ground circuit at the Trigger Module.
Is the voltage at least the same as battery voltage?
Yes
- Go To 9
No
- Repair the open circuit.
- Perform the TPM VERIFICATION TEST. Tire Pressure Monitor (TPM) Verification Test.
9. CHECK FOR ADDITIONAL TRIGGER MODULE COMMUNICATION RELATED DTCs
1. With the scan tool, select Network View and select Advanced.
Is there more than one module with active DTCs "Logged Against" the WCM?
Yes
- Replace/update the WCM.
- Perform the TPM VERIFICATION TEST. Tire Pressure Monitor (TPM) Verification Test.
No
- Replace the Tire pressure trigger Module.
- Perform the TPM VERIFICATION TEST. Tire Pressure Monitor (TPM) Verification Test.