For 1990-2009 cars

### 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 Descriptor

DTC B1534 02: Left Rear Door Handle Switch Circuit Short to Ground
DTC B1535 02: Right Rear Door Handle Switch Circuit Short to Ground

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Passenger Door Handle Switch Signal | B1474 02 | 1 | 1 | --
Left Rear Door Handle Switch Signal | B1534 02 | 1 | 1 | --
Right Rear Door Handle Switch Signal | B1534 02 | 1 | 1 | --
Passenger Door Handle Switch Ground | -- | 1 | 1 | --
Left Rear Door Handle Switch Ground | -- | 1 | 1 | --
Right Rear Door Handle Switch Ground | -- | 1 | 1 | --
1. Power Door Latch Malfunction

### Circuit/System Description

The left and right rear exterior door handle switch signal circuits provide inputs to the remote control door lock receiver when the rear exterior door handle switches are activated. These inputs allow the remote control door lock receiver to detect a rear door open request. The remote control door lock receiver provides voltage to each rear exterior door handle switch via the left and right rear door handle switch signal circuits. When a rear door handle is activated, the switch closes and the voltage signals from the remote control door lock receiver are pulled to ground.

### Conditions for Running the DTC

Battery voltage is between 9-16 volts.

### Conditions for Setting the DTC

#### B1534 02

The remote control door lock receiver detects the left rear exterior door handle switch signal circuit is shorted to ground or closed for more than 180 seconds.

#### B1535 02

The remote control door lock receiver detects the right rear exterior door handle switch signal circuit is shorted to ground or closed for more than 180 seconds.

### Action Taken When the DTC Sets

The remote control door lock receiver ignores inputs from the rear exterior door handle switches.

### Conditions for Clearing the DTC

• | The DTC will be current for as long as the fault is present.

• | When the fault is no longer present, the DTC will be a history DTC.

• | A history DTC will clear after 50 ignition cycles.

### Reference Information

#### Schematic Reference

Door Lock/Indicator Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Power Door Locks 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 scan tool Exterior Left Rear Door Handle Switch or Exterior Right Rear Door Handle Switch parameter while using the rear door handle. The parameter should change between Active and Inactive.

### Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the B27LR Door Handle Switch - Left Rear or B27RR Door Handle Switch - Right Rear.
2. Ignition ON, verify the following scan tool parameter is Inactive:

• | Left rear door: Exterior Left Rear Door Handle Switch

• | Right rear door: Exterior Right Rear Door Handle Switch

⇒ | If not the specified value, test the signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the K77 Remote Control Door Lock Receiver.

3. Connect the a 3 A jumper harness between the signal circuit terminal 2 and ground. Verify the following scan tool parameter is Active.

• | Left rear door: Exterior Left Rear Door Handle Switch

• | Right rear door: Exterior Right Rear Door Handle Switch

⇒ | If not the specified value, test the signal circuit terminal 2 for a open/high resistance. If the circuit tests normal, replace the K77 Remote Control Door Lock Receiver.

4. If all circuits test normal, test or replace the B27LR Door Handle Switch - Left Rear or B27RR Door Handle Switch - Right Rear.

### Component Testing

1. Ignition OFF, disconnect the harness connector at the B27LR Door Handle Switch - Left Rear or B27RR Door Handle Switch - Right Rear.
2. With the switch in the open position, test for infinite resistance between the signal terminal 2 and the ground terminal 1.

⇒ | If not the specified value, replace the B27LR Door Handle Switch - Left Rear or B27RR Door Handle Switch - Right Rear.

3. With the switch in the closed position, test for less than 1 Ω between the signal terminal 2 and the ground terminal 1

⇒ | If greater than the specified range, replace the B27LR Door Handle Switch - Left Rear or B27RR Door Handle Switch - Right Rear.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Rear Side Door Outside Handle Replacement

• | Control Module References for remote control door lock receiver replacement, setup, and programming