Circuit/System Testing: Notes

WARNING: This page is about a different car, the 2008 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

B1340 0B

Use a scan tool to clear the current and history diagnostic trouble code.
Ignition ON, 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 Lumbar Vertical Motor
- Passenger Seat Lumbar Vertical Motor
- Steering Column Tilt Actuator
- Steering Column Telescope Actuator
Use a scan tool to clear the current and history diagnostic trouble code.
Ignition OFF, disconnect the harness connector at the motor/actuator for which the DTC set.
Ignition ON, operate the motor/actuator in both directions then verify that the DTC set.
- If the DTC did not set, test or replace the motor/actuator.
Ignition OFF, disconnect the appropriate X1 or X4 harness connector at the memory seat module.
Ignition ON, test for 0 volts between the appropriate control circuit terminals listed below and ground.
- Driver Seat Lumbar Vertical Motor terminals 1 and 2 X4
- Passenger Seat Lumbar Vertical Motor terminals 4 and 5 X4
- Steering Column Tilt Actuator terminals 7 and 8 X4
- Steering Column Telescope Actuator terminals 7 and 8 X1
- If greater than the specified value, test the control circuit for a short to voltage.
Test for infinite resistance between each control circuit and ground.
- If not the specified value, test the control circuit for a short to ground.
Test for infinite resistance between the control circuits.
- If not the specified value, test for a short between the control circuits.
If all circuits test normal, test or replace the memory seat module.