*NO RESPONSE FROM FCM (FRONT CONTROL MODULE)

For a complete wiring diagram Refer to Section 8W.

Possible Causes

(A108) FUSED B(+) CIRCUIT OPEN AT DLC

(Z11) (Z111) GROUND CIRCUIT OPEN AT DLC

GROUND CIRCUITS OPEN AT FCM

FUSED B(+) CIRCUITS 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.

NOTE: Ensure the scan tool is updated to the latest software.

NOTE: 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.

NOTE: 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.

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.

Go To 2

2. (A108) FUSED B(+) CIRCUIT OPEN AT DLC

Turn the ignition off.
Disconnect the scan tool from the DLC.
Using a 12-volt test light connected to ground, check the (A108) Fused B(+) circuit.

Does the test light illuminate brightly?

Yes

Go To 3

Repair the (A108) Fused B(+) circuit for an open or short.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

3. (Z11) (Z111) GROUND CIRCUIT OPEN AT DLC

Using a 12-volt test light connected to 12-volts, check the (Z11) and (Z111) ground circuits.

Does the test light illuminate brightly for each circuit?

Yes

Go To 4

Repair the ground circuit for an open.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

4. GROUND CIRCUITS OPEN AT FCM C1 CONNECTOR

Disconnect the FCM C1 harness connector.
Using a 12-volt test light connected to 12-volts, check each ground circuit.

Does the test light illuminate brightly for each circuit?

Yes

Go To 5

Repair the ground circuit for an open. Inspect the connector for damage.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

5. GROUND CIRCUITS OPEN AT FCM IPM CONNECTOR

Remove the FCM from the IPM.
Using a 12-volt test light connected to 12-volts, check each ground circuit.

Does the test light illuminate brightly for each circuit?

Yes

Go To 6

Repair the ground circuit for an open. Inspect the connector for damage.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

6. FUSED B(+) CIRCUITS OPEN AT FCM IPM CONNECTOR

Using a 12-volt test light connected to ground, check each Fused B(+) circuit.

Does the test light illuminate brightly for each circuit?

Yes

Replace and program the Front Control Module in accordance with the service information.

Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

Repair the Fused B(+) circuit for an open. Inspect the connector for damage.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).