B1637
B1637-RIGHT HI BEAM CONTROL CIRCUIT LOWB1637 - Right Hi Beam Control Circuit Low:
WHEN MONITORED
With the Highbeam Headlamps activated.
SET CONDITION
When the FCM detects a LOW condition.
POSSIBLE CAUSES
- (L34) right highbeam output circuit
- 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. (L34) RIGHT HIGHBEAM OUTPUT CIRCUIT
Turn the ignition off.
Disconnect the FCM C2 harness connector.
Disconnect the Right Headlamp harness connector.
Measure the resistance between ground and the Right Highbeam Output circuit.
Q: 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 - VER 1. Body Verification Test
NO: Replace the Front Control Module (FCM).
Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test