Power Seat Switch: Testing and Inspection

The Power Seat Switch Diagnostic Test can be used to test whether the switch activations are being recognized by the MHSMM.

Activation
The Power Seat Switch Diagnostic Test can only be activated by sending the proper PCI bus command via the DRB III scan tool to enter diagnostic test number 2.

Upon activation of the test the operator has ten seconds to activate all switches, manual seat switches - all 8 directions, 3 memory switches, and both driver and passenger heat HI and LO requests, but not including the mirrors.

At the conclusion on the ten-second period, the MHSMM can be requested to provide both Pass/Fail test information. A Pass condition occurs only if all the switches are activated. If any of the switches are not activated, Fail will be registered.

Should a Fail condition occur, the individual switch information could be accessed using the proper commands on the DRB III scan tool.

Switch Test

1. Remove switch, refer to Switch Replacement.

Seat Switch Pin Call-Out:

2. Using an ohmmeter, perform the Seat Switch Continuity Test table. If there is no continuity at any of the switch positions, replace switch.

Voltage
The following test will determine whether or not voltage is continuous through the body harness to the switch.
1. Remove power seat switch from mounting position and disconnect switch from wiring harness.
2. Using a voltmeter, connect the ground lead to Pin 5 of the switch harness connector. Connect the positive lead to Pin 1. If battery voltage the ground and B+ circuit is OK. If no voltage check circuit breaker and repair as necessary.