Diagnostic Aids

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.

Inspect the limit switch for any physical damage or obstructions to its mechanical operation which may cause the condition.

DTC 043: Lift Lower Limit Switch Does Not Become Active After 35 Seconds of Descend

Step	Action	Yes	No
Schematic Reference: Passenger Seat Schematics Connector End View Reference: Power Seat Systems Connector End Views
1	Did you review the description and operation and perform the necessary inspections?	Go to Step 2	Go to Symptoms - Seats
2	Verify the fault is present. Does the system operate normally?	Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems	Go to Step 3
3	Does the seat descend out to the lower hard stop?	Go to Step 4	Go to Step 5
4	Retract the seat to the in vehicle facing outward position. Using a DMM measure the voltage of the lower lift limit switch signal circuit to the module by back probing the module connector terminal. Manually operate the lower lift limit switch open and closed by pressing and releasing the contact lever. Does the signal circuit voltage change from high to low as the switch is opened and closed?	Go to Step 6	Go to Step 7
5	Disconnect the extender motor connectors. Connect a test lamp between the motor control circuit terminals in the harness connectors. Press the out switch on the remote. Does the test lamp illuminate?	Go to Step 10	Go to Step 8
6	Test the lift lower limit switch ground circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 11	Go to Step 10
7	Test the lift lower limit switch signal circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 11	Go to Step 9
8	Test the extender motor control circuits for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 11	Go to Step 9
9	Replace the mobility seat control module. Refer to Mobility Seat Control Module Replacement - Sit-N-Lift . Is the repair complete?	Go to Step 11	-
10	Replace the mobility seat base unit. Refer to Seat Base Replacement - Sit-N-Lift . Is the repair complete?	Go to Step 11	-
11	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 3