Circuit/System Testing

WARNING: This page is about a different car, the 2011 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

B1335 0B

Ignition ON, use a scan tool to clear the current and history diagnostic trouble code.
Determine which motor set this DTC by operating the motors listed below one at a time in both directions. Check for the DTC to set between each motor test.
- Driver seat front vertical motor
- Driver seat rear vertical motor
- Driver seat horizontal motor
- Driver seat recline motor
- Driver seat lumbar horizontal motor
Clear the diagnostic trouble code.
Ignition OFF, disconnect the harness connector at the appropriate seat or lumbar motor for which the DTC set.
Ignition ON, operate the motor adjuster switch in both directions. DTC B1335 0B should not set.
- If the DTC sets, test for a short between the appropriate motor control circuits listed below. If the circuits test normal, replace the MSM.
- Driver seat front vertical motor terminal 2 X1 and terminal 5 X1
- Driver seat horizontal motor terminal 3 X1 and terminal 6 X1
- Driver seat rear vertical motor terminal 1 X1 and terminal 4 X1
- Driver seat recline motor terminal A and terminal B X1
- Driver seat lumbar horizontal motor terminal A and terminal B
Test the appropriate control circuits listed below for a high resistance.
- Driver seat front vertical motor terminal 2 X1 and terminal 5 X1
- Driver seat horizontal motor terminal 3 X1 and terminal 6 X1
- Driver seat rear vertical motor terminal 1 X1 and terminal 4 X1
- Driver seat recline motor terminal A and terminal B X1
- Driver seat lumbar horizontal motor terminal A and terminal B
If all circuits test normal, test or replace the appropriate seat or lumbar motor.

B1335 42 or B1335 4B

If either DTC is set history or current, replace the MSM.