No Response From WCM (Wireless Control Module)

NO RESPONSE FROM WCM (WIRELESS CONTROL MODULE)





For a complete wiring diagram, refer to the Wiring Information. Electrical Diagrams






1. TEST FOR INTERMITTENT CONDITION
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. (A412) FUSED B(+) CIRCUIT OPEN OR SHORTED




1. Turn the ignition off.
2. Disconnect the Wireless Control Module harness connector.
3. Using a 12-volt test light connected to ground, check the (A412) Fused B(+) circuit.

Does the test light illuminate brightly?

Yes

- Go To 3

No

- Repair the (A412) Fused B(+) circuit for an open or short.
- Perform the WCM VERIFICATION TEST. Wireless Control Module (WCM) Verification Test

3. (Z914) GROUND CIRCUIT OPEN




1. Using a 12-volt test light connected to 12-volts, check the (Z914) ground circuit.

Does the test light illuminate brightly?

Yes

- Go To 4

No

- Repair the (Z914) ground circuit for an open.
- Perform the WCM VERIFICATION TEST. Wireless Control Module (WCM) Verification Test

4. (F20) FUSED 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) Fused Ignition Switch Output (Run/Start) circuit.

Does the test light illuminate brightly?

Yes

- Go To 5

No

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

5. (D65) CAN C BUS (+) CIRCUIT OPEN




1. Turn the ignition off.
2. Disconnect the Totally Integrated Power Module (TIPM) C1 harness connector.
3. Measure the resistance of the (D65) CAN C Bus (+) circuit between the TIPM C1 harness connector and the Wireless Control Module connector.

Is resistance below 5.0 ohms?

Yes

- Go To 6

No

- Repair the (D65) CAN C Bus (+) circuit for an open.
- Perform the WCM VERIFICATION TEST. Wireless Control Module (WCM) Verification Test

6. (D64) CAN C BUS (-) CIRCUIT OPEN




1. Measure the resistance of the (D64) CAN C Bus (-) circuit between the TIPM C1 harness connector and the Wireless Control Module connector.

Is resistance below 5.0 ohms?

Yes

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

No

- Repair the (D64) CAN C Bus (-) circuit for an open.
- Perform the WCM VERIFICATION TEST. Wireless Control Module (WCM) Verification Test