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 Highbeam Headlamps on.

With the Scan Tool read the DTC information.

Does the Scan Tool read: B1633-LEFT HI BEAM 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) (L33) LEFT HIGHBEAM OUTPUT CIRCUIT

Fig 1: Checking (L33) Left Highbeam Output Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the FCM C2 harness connector.

Disconnect the Left Headlamp harness connector.

Measure the resistance between ground and the Left Highbeam Output circuit.

Is the resistance below 5.0 ohms?

Yes
1. Repair the (L33) Left Highbeam Output circuit for a short to ground condition.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Replace the Front Control Module (FCM) in accordance with the service information.
2. Perform BODY VERIFICATION TEST - VER 1 .