No Response From FCM

NO RESPONSE FROM FCM





For complete wiring diagram refer to the wiring section.

POSSIBLE CAUSES
- (A926) fused B (+) circuit open at DLC
- (Z11) ground circuit open at DLC
- Ground circuits open at FCM
- Fused B+ circuits open at FCM
- (202) fused ignition switch output circuit open at FCM
- Front control module

DIAGNOSTIC TEST

1. TEST FOR INTERMITTENT CONDITION
Turn the ignition on.

NOTE:
- Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.
- Ensure the scan tool is updated to the latest software.
- If the scan tool displays any error messages involving the CAN C Diagnostic circuits, diagnose and repair the error message before proceeding. Refer to the Table of Contents.
- A loss of communication with the FCM can cause the ECU View button on the scan tool to be inoperative (not highlighted). With the scan tool, attempt to select ECU view.

Q: Can the scan tool communicate with the FCM?

YES: The no response condition is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent , pushed out, and corroded terminals.
NO: Go To 2




2. (A926) FUSED B(+) CIRCUIT OPEN AT DLC
Disconnect the scan tool from the DLC.
Using a 12-volt test light connected to ground, check the (A926) Fused B(+) circuit.

Q: Does the test light illuminate brightly?

YES: Go To 3
NO: Repair the (A926) Fused B(+) circuit for an open or short. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test




3. (Z11) GROUND CIRCUIT OPEN AT DLC
Using a 12-volt test light connected to 12-volts, check the (Z11) ground circuit.

Q: Does the test light illuminate brightly?

YES: Go To 4
NO: Repair the (Z11) ground circuit for an open. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test




4. GROUND CIRCUITS OPEN AT FCM C1 AND C2 CONNECTORS
Disconnect the FCM C1 and C2 harness connectors.
Using a 12-volt test light connected to 12-volts, check each ground circuit.

Q: Does the test light illuminate brightly for each circuit?

YES: Go To 5
NO: Repair the ground circuit for an open. Inspect the connector for damage. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test




5. GROUND CIRCUITS OPEN AT FCM PDM CONNECTOR
Remove the FCM from the PDM.
Using a 12-volt test light connected to 12-volts, check each ground circuit.

Q: Does the test light illuminate brightly for each circuit?

YES: Go To 6
NO: Repair the ground circuit for an open. Inspect the connector for damage. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test




6. FUSED B(+) CIRCUITS OPEN AT FCM PDM CONNECTOR
Using a 12-volt test light connected to ground, check each Fused B(+) circuit.

Q: Does the test light illuminate brightly for each circuit?

YES: Go To 7
NO: Repair the Fused B(+) circuit for an open. Inspect the connector for damage. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test




7. (F202) FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN AT FCM PDM CONNECTOR
Turn the ignition on.
Using a 12-volt test light connected to ground, check the (F202) Fused Ignition Switch Output circuit.

Q: Does the test light illuminate brightly?

YES: Replace and program the Front Control Module in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Repair the (F202) Fused Ignition Switch Output circuit for an open. Inspect the connector for damage. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test