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
Turn the ignition on.

Clear all FCM DTC's

Turn the Right Turn Signal on.

With the scan tool, read DTC's.

Does the scan tool read: B1640-FRONT RIGHT TURN CONTROL CIRCUIT HIGH?

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) FRONT RIGHT TURN SIGNAL BULB
Turn the ignition off.

Inspect the Front Right Turn Signal Bulb Assembly.

Is the inoperative bulb OK?

Yes
1. Go To step 3).
No
1. Replace the Inoperative bulb in accordance with the service information.
2. Perform BODY VERIFICATION TEST - VER 1 .
3) L60 RIGHT TURN SIGNAL CONTROL CIRCUIT

Fig 1: Checking L60 Right Turn Signal Control Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the FCM C2 connector.

Measure the resistance of the (L60) Front Right Turn Signal Control circuit.

Is the resistance above 5.0 ohms?

No
1. Repair the (L60) Turn Signal Control circuit for an open.
2. Perform BODY VERIFICATION TEST - VER 1 .
Yes
1. Replace the Front Control Module.
2. Perform BODY VERIFICATION TEST - VER 1 .