Diagnostic Test

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

1) TEST FOR INTERMITTENT CONDITION
With the scan tool, record and erase DTC's

Operate the door locks several times.

Cycle the ignition from on to off.

Turn the ignition on.

With the scan tool, read DTC's.

Does the scan tool display ALL DOOR LOCK RELAY CONTROL CIRCUIT LOW?

Yes
1. Go To step 2).
No
1. The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
2. Perform BODY VERIFICATION TEST - VER 1 .
2) DOOR LOCK RELAY SHORTED

Fig 1: Checking Door Lock Relay For Short
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the Cluster C2 connector.

Remove the PDC fuse #13.

Measure the resistance between ground and the (P777) Door Lock Relay Control circuit in the Cluster C2 connector

Is the resistance below 1000.0 ohms?

No
1. Replace the Instrument Cluster in accordance with service information.
2. Perform BODY VERIFICATION TEST - VER 1 .
Yes
1. Go To step 3).
3) (P777) DOOR LOCK RELAY CONTROL CIRCUIT SHORT TO GROUND

Fig 2: Checking (P777) Door Lock Relay Control Circuit For Short To Ground
Courtesy of DAIMLERCHRYSLER CORP.

Disconnect the Junction Block C2 connector (on top of junction block).

Measure the resistance between ground and the (P777) Door Lock Relay Control circuit in the Cluster C2 connector.

Is the resistance below 1000.0 ohms?

Yes
1. Repair the (P777) Door Lock Relay Control circuit for a short to ground.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Replace the Junction Block in accordance with service information.
2. Perform BODY VERIFICATION TEST - VER 1 .