The overhead console lights ( compass ), ground from the clock spring in the steering wheel, and heated seats do share a common ground and splice. G200 is in the passenger side kick panel by the fuel inertia switch ( actually looks closer to the floor, but behind that panel ). Also a splice moving away from that ground point. The splice is for the heated seats and the overhead console, and the other wire on that bolt should be from the clock spring ( should only be 2 wires ).
Is this the ground you checked ?
Quick test could be to check for continuity between the heated seat module ( under each seat ), the black wire in pin 8 on the connector should be the same at the bolt in the kick panel body and at the seat ( < 10 ohms between the module and the bolt ).
Depending on what you find with that:
1. CC not working
1.1. Did you have the CC recall done ?
1.2. Does you CHMSL work ?
1.3. Did you try the self test ?
Quote:
Self-Test Diagnostics
WARNING:
This test is a key on engine off (KOEO) test only that is conducted in park only with emergency brake fully engaged.
1. Enter self-test diagnostics by depressing the speed control OFF switch while turning the ignition key ON, making sure the engine does not start and is not running. The speed control indicator on the instrument panel will flash once to indicate that speed control module entered the diagnostic mode. Five additional flashes at this point indicate a defective speed control servo. Release the OFF switch.
2. Press the remaining switches in this sequence: ON, RESUME, COAST and SET/ACCEL.
If the ON switch is not depressed within five seconds after entering the diagnostics mode, the module times out and the procedure must be started over.
The speed control indicator lamp will flash as each switch is depressed. Press each switch in the sequence immediately after the indicator light goes out for the previous switch.
Note:
There will be a slight delay when the last button is pressed and the lamp flashes.
3. A lamp flash with the last button (SET/ACCEL) indicates that the static test passed. If the lamp does not flash with the last button and there are no additional flashes of the lamp, the switch is defective.
If the lamp does not flash with the last button, and additional flashes occur, follow the chart below for trouble codes:
— 2 flashes - BPP defective, circuit is defective, brake applied, CPP switch or jumper (if equipped).
— 3 flashes - deactivator switch is open or circuit defective.
— 4 flashes - vehicle speed signal is out of range or circuit is defective
4. Immediately (.25 second delay) after the static test, the speed control servo does a dynamic test by automatically actuating the throttle lever from 8 mm (0.315 in) to 12 mm (0.472 in) of travel from the idle position. During the dynamic throttle pull, observe throttle movement to witness any binding or sticking of the speed control cable and correct connection of speed control cable to throttle lever. Make sure the throttle returns to the idle position.
5. Return the ignition switch to the OFF position and proceed to the Symptom Chart.
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2. Compass not working
2.1. Do the map lights in the overhead work ?
2.1.1. Same circuit as the illuminated vanity mirrors.
2.2. Did you check the fuse
3. Power seat portion works, but the heating part does not ?
3.1. Have you checked both sides to see if either work.
3.2. Did you check both fuses for the heated seats ( there are 2 for both to work ). I would say CJB ( aka Central Junction Box . cab fuse panel ) Fuse #23, 10A is blown if the controller does not turn on, but check both of them to be sure.
Linear Mode
