B1633
B1633-LEFT HI BEAM CONTROL CIRCUIT LOWB1633-Left Hi Beam Control Circuit Low:
WHEN MONITORED
With the Headlamps activated.
SET CONDITION
When the FCM detects a LOW condition.
POSSIBLE CAUSES
- (L33) left highbeam output circuit
- Front control module
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.
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: B1633-LEFT 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. (L33) LEFT HIGHBEAM OUTPUT CIRCUIT
Turn the ignition off.
Disconnect the FCM C2 harness connector.
Measure the resistance between ground and the Left Highbeam Output circuit.
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 (L33) Left Highbeam Output circuit for a short to ground condition. Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test