B161F
B161F-READING LAMP CONTROL CIRCUIT LOWB161F-Reading Lamp Control Circuit Low:
WHEN MONITORED
SET CONDITION
POSSIBLE CAUSES
- M27 Reading/rail lamp driver
- Reading/map lamp assembly
- Instrument cluster
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.
DIAGNOSTIC TEST
1. INTERMITTENT CONDITION
Turn the ignition on.
With the Scan Tool, clear all CCN DTC's.
Turn the Reading Lamps on.
With the Scan Tool read the DTC information.
Q: Does the Scan Tool read: B161F-READING LAMP 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 BODY VERIFICATION TEST - VER 1. Body Verification Test
2. M27 READING/RAIL LAMPS DRIVER
Turn the ignition off.
Disconnect the CCN C3 harness connector.
Measure the resistance between ground and the (M27) Reading/Rail Lamps Driver circuit.
Q: Is the resistance below 5.0 ohms?
YES: Go To 3
NO: Repair the (M27) Reading/Rail Lamps Driver circuit for a short to ground. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
3. INSTRUMENT CLUSTER
Turn the ignition off.
Disconnect the CCN C3 harness connector.
Disconnect the Reading/Map Lamp connector.
Measure the resistance between ground and the (M27) Reading/Rail Lamps Driver circuit.
Q: Is the resistance below 5.0 ohms?
YES: Replace the Instrument Cluster. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Replace the Reading/Map Lamp Assembly. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test