Volt

Exterior Door Handle Switch Malfunction - DTC B1474, B1534, B1535, or B3849

The exterior door handle switch signal circuits provide inputs to the keyless entry control module when the exterior door handle switches are activated. These inputs allow the keyless entry control module to detect a door unlock request. The keyless entry control module provides a 12 V signal to each exterior door handle switch via the door handle switch signal circuits. When a door handle switch is pressed, the switch closes and the voltage signals from the keyless entry control module are pulled to ground.

Battery voltage is between 9-16 V.

B1474 02

The keyless entry control module detects the passenger exterior door handle switch signal circuit is shorted to ground or closed for greater than 180 s

B1534 02

The keyless entry control module detects the left rear exterior door handle switch signal circuit is short-circuited to ground or closed for more than 180 s.

B1535 02

The keyless entry control module detects the right rear exterior door handle switch signal circuit is short-circuited to ground or closed for more than 180 s.

B3849 02

The keyless entry control module detects the driver exterior door handle switch signal circuit is short-circuited to ground or closed for more than 180 s.

The keyless entry control module will ignore input from the affected door switch and the door will not unlock when the door handle switch is pressed.

Schematic Reference

Door Lock/Indicator Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Keyless Entry System Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Vehicle in Service Mode, observe the scan tool keyless entry control module Exterior Driver Door Handle Switch, Exterior Passenger Door Handle Switch, Exterior Left Rear Door Handle Switch and Exterior Right Rear Door Handle Switch parameters while pressing and releasing each exterior door handle switch. The parameter for each should change between Active and Inactive

1. Vehicle OFF, disconnect the harness connector at the appropriate exterior A24 door handle assembly.
2. Test for less than 5 Ω between the ground circuit terminal 4 and ground.

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

3. Vehicle in Service Mode, verify the appropriate scan tool Exterior Door Handle Switch parameter is Inactive.

⇒	If not the specified value, test the signal circuit terminal 3 for a short to ground. If the circuit tests normal, replace the K84 keyless entry control module.

4. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the ground circuit terminal 4. Verify the scan tool Exterior Door Handle Switch parameter is Active.

⇒	If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K84 keyless entry control module

5. If all circuits test normal, test or replace the A24 door handle assembly.

Exterior Door Handle Switch Test

1. Vehicle OFF, disconnect the harness connector at the appropriate exterior A24 door handle assembly.
2. With the switch in the open position, test for infinite resistance between the signal terminal 3 and the ground terminal 4.

⇒	If not the specified value, replace the exterior A24 door handle assembly.

3. With the switch in the closed position, test for less than 5 Ω between the signal terminal 3 and the ground terminal 4.

⇒	If greater than the specified range, replace the exterior A24 door handle assembly.

Perform the Diagnostic Repair Verification after completing the repair.