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) INTERMITTENT CONDITION
Turn the ignition on.

With the Scan Tool, clear all FCM DTC's.

Turn the Right Turn Signals on.

With the Scan Tool read the DTC information.

Does the Scan Tool read: B1647-REAR RIGHT TURN CONTROL CIRCUIT LOW?

Yes
1. Go To step 2).
No
1. The condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.
2. Perform BODY VERIFICATION TEST - VER 1 .
2) L62 RIGHT TURN SIGNAL CONTROL CIRCUIT

Fig 1: Checking L62 Right Turn Signal Control Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the IPM C2 connector.

Disconnect the Right Rear Tail Lamp connector.

Measure the resistance between ground and the (L62) Rear Turn Signal Control circuit.

Is the resistance below 5.0 ohms?

Yes
1. Repair the (L62) Rear Right Turn Signal Control circuit for a short to ground.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Go To step 3).
3) FRONT CONTROL MODULE

Fig 2: Checking Front Control Module
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the Front Control Module from the IPM 49-way connector.

Measure the resistance between ground and the (L62) Right Turn Signal Control circuit in the PDC.

Is the resistance below 5.0 ohms?

Yes
1. Replace the Power Distribution Center in accordance with the service information.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Replace the Front Control Module in accordance with the service information.
2. Perform BODY VERIFICATION TEST - VER 1 .