Buick Regal: Sunshade Illumination Malfunction
Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
- Diagnostic Procedure Instructions provides an overview of each
diagnostic category.
Diagnostic Fault Information
1. Reading Lamps Always OFF
2. Sunshade Lamps Always OFF
3. Instrument Panel Compartment Lamp Always OFF
Circuit/System Description
The body control module (BCM) supplies the dome/reading lamps, sunshade and
instrument panel
compartment lamp with battery voltage. When switching on the following
components the concerning
lamps will illuminate:
- Dome/reading lamps
- Dome/reading lamps - row
- Sunshade - left Front
- Sunshade - right Front
- Instrument Panel compartment lamp
Reference Information
Schematic Reference
Interior Lights Wiring Schematics
Connector End View Reference
COMPONENT CONNECTOR END VIEWS - INDEX
Description and Operation
Interior Lighting Systems Description and Operation
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information.
Circuit/System Verification
Ignition ON, observe the lamp of the sunshade - left front/sunshade - right
front while opening and
closing. The lamp should illuminate when opened.
Circuit/System Testing
Sunshade Light Circuit Malfunction
1. Ignition OFF, disconnect the harness connector at the appropriate
sunshade.
2. Disconnect the negative terminal of the C1 Battery.
3. Test for less than 5 Ω between the ground circuit terminal B and ground.
- If greater than the specified range, test the ground circuit for an
open/high resistance.
4. Reconnect the negative terminal to the C1 Battery.
5. Ignition ON, test for greater than 11 V between the circuit terminal A and
the ground circuit
terminal B.
- If less than the specified range, test the 12 V circuit for a short to
ground or an open/high
resistance. If the circuit tests normal, replace the K9 Body Control Module.
6. If all circuits test normal, test or replace the A3L Sunshade - Left or
A3R Sunshade - Right.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic
procedure.
- Sunshade Replacement
- Sunshade Support Replacement
- Control Module References for BCM replacement, setup, and programming
READ NEXT:
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Calibration Criteria
NOTE: Do not apply the brake pedal during the brake pedal position
sensor
calibration procedure. Any movement of the brake pedal during this
procedure will cause the calibration
SEE MORE:
The Tire Pressure Monitor System
(TPMS) uses radio and sensor
technology to check tire pressure
levels. The TPMS sensors monitor
the air pressure in your tires and
transmit tire pressure readings to a
receiver located in the vehicle.
Each tire, including the spare (if
provided), should be checked
m
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diagnostic Procedure Instructions provides an overview of each
diagnostic category.
DTC Descriptors
D