Backup Lamps Always On. Buick Century 2001

GM Service Manual Online

For 1990-2009 cars only

Makes 🢒 Buick 🢒 2001 🢒 Century 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Backup Lamps Always On

Backup Lamps Always On Regal

Step	Action	Yes	No
Schematic Reference: Exterior Lights Schematics
1	Did you perform the Lighting System Diagnostic System Check?	Go to Step 2	Go to Diagnostic System Check - Lighting Systems
2	Turn the ignition to the on position. Shift the gear selector lever to the REVERSE position and then to the PARK position. Do the backup lamps turn on in REVERSE and turn off in PARK?	Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems	Go to Step 3
3	Remove the backup lamp relay. Do the backup lamps turn off?	Go to Step 4	Go to Step 6
4	Connect a test lamp between the control circuit of the backup lamp relay and the coil side supply of the backup lamp relay. Does the test lamp illuminate?	Go to Step 5	Go to Step 8
5	Insure that the park/neutral position switch is functioning properly. Refer to Diagnostic Starting Point - Automatic Transmission in Automatic Transaxle-4T65-E. is the park/neutral position switch functioning properly?	Go to Step 7	Go to Park/Neutral Position Switch Replacement in Automatic Transaxle-4T65-E
6	Repair a short to battery positive voltage in the backup lamp supply voltage circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair?	Go to Step 9	--
7	Important: Perform the set up procedures for the Body Control Module (BCM). Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System. Replace the BCM. Refer to Body Control Module Replacement in Body Control System. Did you complete the repair?	Go to Step 9	--
8	Replace the backup lamp relay. Refer to Relay Replacement in Wiring Systems. Did you complete the repair?	Go to Step 9	--
9	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 2

Backup Lamps Always On Century

Step	Action	Yes	No
Schematic Reference: Exterior Lights Schematics
1	Did you perform the Lighting System Diagnostic System Check?	Go to Step 2	Go to Diagnostic System Check - Lighting Systems
2	Turn the ignition to the on position. Shift the gear selector lever to the REVERSE position and then to the PARK position. Do the backup lamps turn on in REVERSE and turn off in PARK?	Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems	Go to Step 3
3	Disconnect the park/neutral position switch. Do the backup lamps turn off?	Go to Step 5	Go to Step 4
4	Repair a short to battery positive voltage in the backup lamp supply voltage circuit. Refer to Wiring Repairs in Wiring Systems. Has the repair been made?	Go to Step 6	--
5	Adjust or repair the park/neutral position switch. Refer to Park/Neutral Position Switch Adjustment in Automatic Transaxle-4T65-E. Did you complete the repair?	Go to Step 6	--
6	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 2