No Response From WCM (Wireless Control Module)

NO RESPONSE FROM WCM (WIRELESS CONTROL MODULE)












1. TEST FOR INTERMITTENT CONDITION

NOTE: Check for any Technical Service Bulletins (TSBs) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing.

1. Turn the ignition on.

NOTE: Make sure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.

2. Using the scan tool, select ECU View.

NOTE: A red "X" will be next to the module that is not communicating, indicating that the module is not active on the Bus network. A green check indicates that the module is active on the Bus network.

Does the scan tool display a red "X" next to the module?

Yes

- Go To 2

No

- 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.

2. (A411) FUSED B(+) CIRCUIT OPEN OR SHORTED




1. Turn the ignition off.
2. Disconnect the WCM harness connector.
3. Using a 12-volt test light connected to ground, check the (A411) Fused B(+) circuit.

Does the test light illuminate brightly?

Yes

- Go To 3

No

- Repair the (A411) Fused B(+) circuit for an open or short.
- Perform the WCM VERIFICATION TEST. Wireless Control Module (WCM) Verification Test.

3. (Z910) GROUND CIRCUIT OPEN




1. Using a 12-volt test light connected to 12-volts, check the (Z910) ground circuit.

Does the test light illuminate brightly?

Yes

- Go To 4

No

- Repair the (Z910) ground circuit for an open.
- Perform the WCM VERIFICATION TEST. Wireless Control Module (WCM) Verification Test.

4. (F20) IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT OPEN OR SHORTED




1. Turn the ignition on.
2. Using a 12-volt test light connected to ground, check the (F20) Ignition Switch Output (Run-Start) circuit.

Does the test light illuminate brightly?

Yes

- Go To 5

No

- Repair the (F20) Ignition Switch Output (Run-Start) circuit for an open or short.
- Perform the WCM VERIFICATION TEST. Wireless Control Module (WCM) Verification Test.

5. (D55) AND (D54) CAN B BUS CIRCUITS OPEN





NOTE: One open circuit will not cause this condition.

1. Measure the voltage between the (D54) CAN B Bus (-) circuit and ground.
2. Measure the voltage between the (D55) CAN B Bus (+) circuit and ground.

Is there any voltage present on either circuit?

Yes

- Replace the Wireless Control Module.
- Perform the WCM VERIFICATION TEST. Wireless Control Module (WCM) Verification Test.

No

- Repair the (D55) and (D54) CAN B Bus circuits for an open. Inspect the connector for damage.
- Perform the WCM VERIFICATION TEST. Wireless Control Module (WCM) Verification Test.