U1114–LOST COMMUNICATION WITH LEFT FRONT TIRE PRESSURE TRIGGER MODULE

For a complete wiring diagram Refer to Section 8W.

When Monitored:

With the ignition on
Battery voltage between 10 and 16 volts
IOD fuse installed

Set Condition:
If the 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.

Possible Causes

(D508) COM - LIN TIRE PRESSURE MONITOR LAN CIRCUIT SHORT TO VOLTAGE

(D508) COM - LIN TIRE PRESSURE MONITOR LAN CIRCUIT SHORT TO GROUND

(D508) COM - LIN TIRE PRESSURE MONITOR LAN CIRCUIT OPEN OR HIGH RESISTANCE

(F202) FUSED IGNITION SWITCH OUTPUT (RUN) CIRCUIT OPEN OR HIGH RESISTANCE

(Z904) GROUND CIRCUIT(S) OPEN OR HIGH RESISTANCE

(D508) COM-LIN TIRE PRESSURE MONITOR LAN CIRCUIT OPEN

TIRE PRESSURE TRIGGER MODULE POWER AND GROUND

WCM

Diagnostic Test

1.VERIFY DTC IS ACTIVE

NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.

Does this DTC reset?

Yes

Go To 2

Perform the Stored Lost Communication test procedure. Refer to the table of contents in this section. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING).
Perform BODY VERIFICATION TEST. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

2. (D508) COM-LIN TIRE PRESSURE MONITOR LAN CIRCUIT OPEN

Is the resistance below 5 Ohms?

Yes

Go To 3

Repair or replace the open circuit.
Perform TPM VERIFICATION TEST. (Refer to 22 - TIRES/WHEELS/TIRE PRESSURE MONITORING - STANDARD PROCEDURE)

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

Repair the (F202) Fused Ignition Switch Output (Run) circuit for an open circuit or high resistance.
Perform TPM VERIFICATION TEST. (Refer to 22 - TIRES/WHEELS/TIRE PRESSURE MONITORING - STANDARD PROCEDURE)

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

Does the test light illuminate brightly?

Yes

Go to 5

Repair the (Z904) Ground circuit(s) for an open circuit or high resistance.
Perform TPM VERIFICATION TEST. (Refer to 22 - TIRES/WHEELS/TIRE PRESSURE MONITORING - STANDARD PROCEDURE)

Is there any voltage present?

Yes

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

Go to 6
Perform TPM VERIFICATION TEST. (Refer to 22 - TIRES/WHEELS/TIRE PRESSURE MONITORING - STANDARD PROCEDURE)

Is the resistance below 5.0 ohms?

Yes

Repair the (D508) COM - LIN Tire Pressure Monitor LAN circuit for a short to ground.
Perform TPM VERIFICATION TEST. (Refer to 22 - TIRES/WHEELS/TIRE PRESSURE MONITORING - STANDARD PROCEDURE)

Go to 7

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 8

Repair the (D508) COM - LIN Tire Pressure Monitor LAN circuit for an open circuit or high resistance.
Perform TPM VERIFICATION TEST. (Refer to 22 - TIRES/WHEELS/TIRE PRESSURE MONITORING - STANDARD PROCEDURE)

8. POWER AND GROUND CIRCUIT OPEN

Is the voltage at least the same as battery voltage?

Yes

Go To 9

Repair the open circuit.
Perform TPM VERIFICATION TEST. (Refer to 22 - TIRES/WHEELS/TIRE PRESSURE MONITORING - STANDARD PROCEDURE)

9.CHECK FOR ADDITIONAL TRIGGER MODULE COMMUNICATION RELATED DTCs

Is there more than one module with active DTCs “Logged Against” the WCM?

Yes

Replace/update the WCM in accordance with the service information.
Perform TPM VERIFICATION TEST. (Refer to 22 - TIRES/WHEELS/TIRE PRESSURE MONITORING - STANDARD PROCEDURE)

Replace the Tire pressure trigger Module in accordance with the service information.
Perform TPM VERIFICATION TEST. (Refer to 22 - TIRES/WHEELS/TIRE PRESSURE MONITORING - STANDARD PROCEDURE)