Diagnostic Test

WARNING: This page is about a different car, the 2009 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

INTERMITTENT CONDITION
1. Turn the ignition on.
2. Using the scan tool, clear all FCM DTCs.
3. Turn the Highbeam Headlamps on.
4. With the scan tool read the DTC information.
  Does the scan tool read: B1637-RIGHT HI BEAM CONTROL CIRCUIT LOW?
  
  Yes
  - Go to step 2
  No
  - 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.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
(L34) RIGHT HIGHBEAM OUTPUT CIRCUIT

Fig 1: Checking Right Highbeam Output Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the FCM C2 harness connector.
3. Disconnect the Right Headlamp harness connector.
4. Measure the resistance between ground and the Right Highbeam Output circuit.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Repair the (L34) Right Highbeam Output circuit for a short to ground condition.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
  No
  - Replace the Front Control Module (FCM) in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .