GM Service Manual Online
For 1990-2009 cars only

Diagnostic Fault Lamp Status

Diagnostic Procedure

Module

LFT, STEER AXLE, and SENSOR illuminated

Status Lamps Illuminated - LFT, STEERAXLE, and SEN

Bendix Remote Diagnostic Unit (RDU)

RGT, STEER AXLE, and SENSOR illuminated

Status Lamps Illuminated - RHT, STEERAXLE, and SEN

Bendix Remote Diagnostic Unit (RDU)

LFT, DRIVE AXLE, and SENSOR illuminated

Status Lamps Illuminated - LFT, DRIVEAXLE and SEN

Bendix Remote Diagnostic Unit (RDU)

RGT, DRIVE AXLE, and SENSOR

Status Lamps Illuminated - RHT, DRIVEAXLE, and MOD

Bendix Remote Diagnostic Unit (RDU)

LFT, STEER AXLE, and MODULATOR illuminated

Status Lamps Illuminated - LFT, STEERAXLE, and MOD

Bendix Remote Diagnostic Unit (RDU)

RGT, STEER AXLE, and MODULATOR

Status Lamps Illuminated - RHT, STEERAXLE, and MOD

Bendix Remote Diagnostic Unit (RDU)

LFT, DRIVE AXLE, and MODULATOR

Status Lamps Illuminated - LFT, DRIVEAXLE, and MOD

Bendix Remote Diagnostic Unit (RDU)

RGT, DRIVE AXLE, and MODULATOR illuminated

Status Lamps Illuminated - RHT, DRIVEAXLE, and MOD

Bendix Remote Diagnostic Unit (RDU)

TRACTION, and MODULATOR illuminated

Status Lamps Illuminated - TRC and MOD

Bendix Remote Diagnostic Unit (RDU)

ECU illuminated

Status Lamps Illuminated - Engine Control Unit

Bendix Remote Diagnostic Unit (RDU)

Green VLT OFF or flashing

Green VLT Status Lamp Inoperative

Bendix Remote Diagnostic Unit (RDU)

Any other combination of illuminated LEDs

Status Lamps Illuminated - Invalid Combination

Bendix Remote Diagnostic Unit (RDU)