Electrically Heated Rear Seat Not Working

Electrically Heated Rear Seat Not Working







Fault symptoms

Rear seat heating does not work for one or both pads.

Conditions

A break in the circuit from the relay to the heating pad or a break in the circuit to pin 9 of the control module.

Diagnostic help

The control module output can be activated and the control module input from the switch can be read using the diagnostic tool.

If the indicator lamp lights on activation of the control module output, the fault probably lies between fuse B and pin 9 on TWICE.

If the indicator lamp does not light on activation of the control module output, the fault probably lies in the circuit from relay (511) to the heating pad (64RL/RR).

Check the wiring

Jiggle the wiring harness in several places and in various directions to detect intermittent open circuits and short circuits in the wiring harness. Watch the multimeter, diagnostic tool and test lamp during the check.