Where is the G-Switch located?

BECKYXX92

MEMBER
2002 JEEP GRAND CHEROKEE
4.7L
V8
4WD
AUTOMATIC
174,000 MILES

I have 3 codes right front wheel speed/signal malfunction, right rear wheel speed/signal malfunction, and g-switch malfunction. I thought I would start with the g-switch because the person I got it from said they changed both rear wheel bearings. I also know they changed the ABS module with a new one. I don't know where this g-switch is. I looked under the whole carpet under my back seat and even cut the carpet up. Any help would be much appreciated.

1 Reply

BORIS K

MECHANIC
762 POSTS

Hello,

G switch - Acceleration / Deceleration sensor

The switch is the acceleration / deceleration switch. The location for the switch is at the rear seat bottom assembly, you will have to lift up on the carpet to gain access to it.

The switch has a directional arrow and must be mounted with the arrow pointing towards the front of the vehicle.

OPERATION
The switch is monitored by the CAB (Controller Antilock Brake) at all times. The switch contains three mercury switches which monitor vehicle deceleration rates (G-force). Sudden changes in deceleration rates trigger the switch, sending a signal to the CAB.

See images below for location, mounting and wiring/pin out back to ABS module.

How to check wiring:
https://www.2carpros.com/articles/how-to-check-wiring

Cheers, Boris

Images (Click to make bigger)