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

NO RESPONSE FROM WCM (SENTRY KEY REMOTE ENTRY MODULE)

No Response From WCM (Sentry Key Remote Entry Module):

POSSIBLE CAUSES
- (A411) Fused B(+) circuit open or shorted
- (Z906) Ground circuit open
- (F20) Fused ignition switch output circuit open or shorted
- (D55) and (D54) CAN B BUS circuits open
- Sentry key remote entry 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.

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.

Q: 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

Turn the ignition off.
Disconnect the Sentry Key Remote Entry Module harness connector. Using a 12-volt test light connected to ground, check the (A411) Fused B(+) circuit.

Q: Does the test light illuminate brightly?

YES: Go To 3
NO: Repair the (A411) Fused B(+) circuit for an open or short. Perform SKREEM VERIFICATION TEST. Vehicle Theft Security Verification Tests




3. (Z906) GROUND CIRCUIT OPEN

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

Q: Does the test light illuminate brightly?

YES: Go To 4
NO: Repair the (Z906) ground circuit for an open. Perform SKREEM VERIFICATION TEST. Vehicle Theft Security Verification Tests




4. (F20) FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN OR SHORTED

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

Q: 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 SKREEM VERIFICATION TEST. Vehicle Theft Security Verification Tests




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

NOTE: One open circuit will not cause this condition.

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

Q: Is there any voltage present on either circuit?

YES: Replace the Sentry Key Remote Entry Module. Perform SKREEM VERIFICATION TEST. Vehicle Theft Security Verification Tests
NO: Repair the (D55) and (D54) CAN B Bus circuits for an open. Inspect the connector for damage. Perform SKREEM VERIFICATION TEST. Vehicle Theft Security Verification Tests