Brakes - ABS Light On With Code 25 and Code 35

91chevy07

Number: 91-199-5


Section: 5


Date: February 1991


Corporate Bulletin No.: 135002


Subject: ABS LIGHT ON


Model and Year: 1991 CAPRICE SEDAN


Condition: ABS light comes on with Code # 25 (left front wheel speed sensor fault) and Code # 35 (rear axle speed sensor fault).


Cause: A voltage may be induced in the right front wheel sensor wire if it is too close to the spark plug wires.


Correction: To improve this clearance, the speed sensor wire bracket was moved on the frame to allow more clearance from the plug wires. This is on all vehicles built after VIN # MW187731.








To obtain more clearance on vehicles built prior to this, reroute the wheel speed sensor wire through the bracket on the frame so that it enters the bracket from the front of the vehicle instead of the rear.


Do not use the clip which is attached to the inner fender just below the connector. Instead, attach the sensor wire to the relay center harness with a tie wrap as shown in the illustration of the revised routing. Position the wire through the bracket to obtain at least 4 inch clearance from the spark plug wires.

Labor Operation Number: T1695

Labor Time : 0.3 Hours

Trouble Code: 92