Chevrolet Silverado / GMC Sierra. Service manual — part 1536

Description and Operation

Door Ajar Indicator Description and Operation (w/AN3) or Door Ajar Indicator
Description and Operation (w/o AN3)

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

1. Install a scan tool and with the front doors closed, verify the DDS and PDS door ajar switch

parameters are Inactive.

If either of the door ajar switch parameters are Active while the doors are closed
perform the Front Door Ajar Switch Circuit Test.

2. Open the doors and verify the door ajar switch parameters are Active.

If either of the door ajar switch parameters are Inactive while the doors are open
perform the Front Door Ajar Switch Circuit Test.

3. With the rear doors closed, verify the BCM door ajar switch parameters are Door Closed.

If either of the door ajar switch parameters are Door Ajar while the doors are closed
perform the Rear Door Ajar Switch Circuit Test.

4. Open the doors and verify the door ajar switch parameters are Door Ajar.

If either of the door ajar switch parameters are Door Closed while the doors are open
perform the Rear Door Ajar Switch Circuit Test.

5. If the door ajar switch inputs to the DDS, PDS, and BCM function normally replace the

IPC.

Circuit/System Testing

Front Door Ajar Switch Circuit Test

1. Ignition OFF, disconnect the harness connector at the affected door latch.

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Vehicle Access - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

2. Test for less than 1 ohm of resistance between the listed low reference circuit terminal and

ground.

Driver terminal 8

Passenger terminal 3

If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify the scan tool door ajar switch parameter is Inactive.

If not the specified value, test the listed signal circuit terminal for a short to ground. If
the circuit tests normal, replace the affected door lock and side window switch.

Driver terminal 6

Passenger terminal 1

4. Install a 3A fused jumper wire between the listed signal circuit terminal and low reference

circuit terminal. Verify the scan tool door ajar switch parameter is Active.

Driver terminal 6 to 8

Passenger terminal 1 to 3

5. If all circuits test normal, test or replace the affected door latch.

Rear Door Ajar Switch Circuit Test

1. Ignition OFF, disconnect the harness connector at the affected door latch.

2. Test for less than 1 ohm of resistance between the listed low reference circuit terminal and

ground.

Left terminal 6

Passenger terminal 3

If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify the scan tool door ajar switch parameter is Door Closed.

If not the specified value, test the listed signal circuit terminal for a short to ground. If
the circuit tests normal, replace the BCM.

Left terminal 4

Right terminal 1

4. Install a 3A fused jumper wire between the listed signal circuit terminal and low reference

circuit terminal. Verify the scan tool door ajar switch parameter is Door Closed.

Left terminal 4 to 6

Passenger terminal 1 to 3

5. If all circuits test normal, test or replace the affected door latch.

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Vehicle Access - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Front Side Door Lock Replacement

Rear Door Lock Replacement (Extended Cab Upper) or Rear Door Lock
Replacement (Crew Cab) or Rear Door Lock Replacement (Extended Cab Lower)

Control Module References for the IPC, DDS, PDS, or BCM replacement, setup, and
programming.

DOOR AJAR INDICATOR MALFUNCTION (W/O AN3)

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

Circuit

Short to

Ground

Open/High

Resistance

Short to

Voltage

Signal

Performance

Left Front Door Ajar Switch
Signal

2

1

-

-

Right Front Door Ajar Switch
Signal

2

1

-

-

Left Rear Door Ajar Switch
Signal

2

1

-

-

Right Rear Door Ajar Switch
Signal

2

1

-

-

Left Front Door Ajar Switch
Ground

-

1

-

-

Right Front Door Ajar Switch
Ground

-

1

-

-

Left Rear Door Ajar Switch
Ground

-

1

-

-

Right Rear Door Ajar Switch
Ground

-

1

-

-

1. Door Ajar Message Always Displayed

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Vehicle Access - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

Circuit/System Description

The BCM receives discrete inputs from ajar switches in the front and rear door latch assemblies
to indicate the status of the doors. The door ajar switches are normally open when the doors are
fully closed. When a door is opened, the door ajar switch contacts close providing a path to
ground. The instrument panel cluster (IPC) receives a GMLAN serial data message from the
BCM indicating the door ajar status and the driver information center (DIC) located at the
bottom of the IPC, illuminates the appropriate door ajar message when one of the doors is open.
If this message is displayed and the vehicle speed is greater than 8.1 km/h (5 mph), a chime will
sound.

Reference Information

Schematic Reference

Interior Lights Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Door Ajar Indicator Description and Operation (w/AN3) or Door Ajar Indicator
Description and Operation (w/o AN3)

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

2. Door Ajar Message Not Displayed

2008 Chevrolet Silverado 1500

2008 ACCESSORIES & EQUIPMENT Vehicle Access - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado