Convertible Top: 9078

9078 NO COMMUNICATION WITH CENTRAL LOCKING PUMP/SECURITY SYSTEM MODULE (CPL/SSM)

9078 No Communication With Central Locking Pump/Security System Module (CPL/SSM):

WHEN MONITORED
Continuous with the ignition on.

SET CONDITION
CAN Bus communication failure between the Central Locking Pump/Security System Module and the Power Top Control Module (PTCM).

POSSIBLE CAUSES
- Open CAN B BUS (+) circuit
- Open CAN B BUS (-) circuit
- Power top control module

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

DIAGNOSTIC TEST

1. Open CAN B Bus (+) circuit




Turn the ignition off.
Disconnect the Power Top Control Module (PTCM) C1 harness connector.
Disconnect the Central Locking Pump/Security System Module (CLP/SSM) harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance of the CAN B Bus (+) circuit from the PTCM C1 harness connector to the CLP/SSM harness connector.

Q: Is the resistance below 5.0 ohm?

YES: Go To 2
NO: Repair the PTCM CAN B Bus (+) circuit for an open. Perform POWER TOP CONTROL MODULE VERIFICATION TEST. Power Top Verification Test

2. Open CAN B Bus (-) circuit




Measure the resistance of the CAN B Bus (-) circuit from the PTCM C1 harness connector to the CLP/SSM harness connector.

Q: Is the resistance below 5.0 ohm?

YES: Replace the Power Top Control Module. Perform POWER TOP CONTROL MODULE VERIFICATION TEST. Power Top Verification Test
NO: Repair the PTCM CAN B Bus (-) circuit for an open. Perform POWER TOP CONTROL MODULE VERIFICATION TEST. Power Top Verification Test