B1637

B1637-RIGHT HI BEAM CONTROL CIRCUIT LOW

B1637 - Right Hi Beam Control Circuit Low:

WHEN MONITORED
With the Highbeam Headlamps activated.

SET CONDITION
When the FCM detects a High condition.

POSSIBLE CAUSES
- (L34) Right highbeam output circuit
- Right high beam bulb
- Front control module

Diagnostic Test

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.

Q: Does the Scan Tool read: B1637-RIGHT HI BEAM CONTROL CIRCUIT LOW?

YES: Go To 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 - VER 1. Body Verification Test

2. RIGHT HIGH BEAM BULB

Turn the ignition off.
Inspect the Right High Beam Bulb assembly for a short condition.

Q: Is the inoperative bulb OK?

YES: Go To 3.
NO: Replace the inoperative bulb.
Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test


3. (L34) RIGHT HIGHBEAM OUTPUT CIRCUIT






Turn the ignition off.
Disconnect the FCM C2 harness connector.
Measure the resistance between ground and the (L34) Right Highbeam Output circuit at the FCM.

Q: Is the resistance below 5.0 ohms?

YES: Replace the Front Control Module (FCM).
Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Repair the (L34) Right Highbeam Output circuit for a short to ground condition.
Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test