No Response From WCM (Wireless Control Module) (Sentry Key Remote Entry Module)

NO RESPONSE FROM WCM (WIRELESS CONTROL MODULE) (SENTRY KEY REMOTE ENTRY MODULE)












1. TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.

NOTE: Ensure the IOD fuse is installed and fully seated and battery voltage is between 10.0 and 16.0 volts.

2. With 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. (Z906) GROUND CIRCUIT OPEN




1. Using a 12-volt test light connected to 12-volts, check the (Z906) ground circuit.

Does the test light illuminate brightly?

Yes

- Go To 4

No

- Repair the (Z906) ground circuit for an open.
- Perform the WCM VERIFICATION TEST. Wireless Control Module (WCM) Verification Test

4. (F20) FUSED IGNITION SWITCH OUTPUT 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 circuit.

Does the test light illuminate brightly?

Yes

- Go To 5

No

- Repair the (F20) Fused Ignition Switch Output 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 Sentry Key Remote Entry Module (WCM).
- 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