Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC B1545 00: Seat Stow Switch 1 CircuitDTC B1546 00: Seat Stow Switch 2 Circuit
DTC B3729 00: Seat Recline Control Switch
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Folding Seat Switch B+ | 1 | 1 | -- | -- |
Folding Seat Front Stow Switch Signal | 1 | 1 | B1545 00 | -- |
Folding Seat Recline Switch Signal | 1 | 2 | B3729 00 | -- |
Folding Seat Rear Stow Switch Signal | 1 | 1 | B1546 00 | -- |
1. Power third row seat inoperative 2. Power third row seat recline inoperative | ||||
Circuit/System Description
When the rear folding seat stow or recline switches are pressed they send a 12-volt signal through the switch signal circuit to the rear seat module (RSM). The RSM then commands the rear folding seat to move in response to the switch inputs.
Conditions for Running the DTC
The RSM must be powered and cannot have DTC B1327 - Battery Voltage Low as an active DTC for this DTC to set.
Conditions for Setting the DTC
If a switch input continues to be active for a period of time after motion in the requested direction has ceased, the switch under test will be considered shorted.
Action Taken When the DTC Sets
| • | A motor output driven in response to a switch considered failed, is deactivated for both directions. |
| • | The RSM will respond to any other switch signal that has not set a DTC. |
Conditions for Clearing the DTC
The DTC automatically clears when the switch circuit setting the DTC is no longer active.
Reference Information
Schematic Reference
Connector End View Reference
Power Seat Connector End Views
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
Ignition ON, observe the following scan tool parameters while pressing the related folding seat switch. The reading should change between Inactive and Active.
| • | Front Stow Switch |
| • | Rear Stow Switch |
| • | Recline Switch |
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the appropriate folding seat stow or recline switch.
- Ignition ON, verify the scan tool Stow or Recline switch parameter is Inactive.
- If all circuits test normal, test or replace the folding seat stow switch.
| ⇒ | If not the specified value, test the signal circuit that displays Active for a short to voltage. If the circuit tests normal, replace the RSM. |
Component Testing
- Ignition OFF, disconnect the harness connector at the folding seat stow switch.
- Test for infinite resistance between signal terminal C and the B+ terminal A with the switch in the open position.
- Test for less than 1 ohm of resistance between signal terminal C and the B+ terminal C with the switch in the closed position.
| ⇒ | If less than the specified value, replace the switch. |
| ⇒ | If greater than the specified value, replace the switch. |
Repair Instructions
Important: After performing this diagnostic test and electrical or component repairs have been completed, the folding seat may be in an unknown state and out of calibration with the RSM. Therefore, the RSM must be calibrated before the folding seat system will operate. Refer to Power Folding Seat Calibration .
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for rear seat module replacement, setup, and programming |
