• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Folding Seat Horizontal Position Sensor Signal | B2375 0A | B2375 0A | B2375 0A | -- |
Folding Seat Recline Position Sensor Signal | B1825 0A | B1825 0A | B1825 0A | -- |
Folding Seat Rotation Position Sensor Signal | B1548 0A | B1548 0A | B1548 0A | -- |
Folding Seat Horizontal Motor Forward Control | B1770 0B | B2375 0A or 1 | -- | -- |
Folding Seat Horizontal Motor Rearward Control | B1770 0B | B2375 0A or 1 | -- | -- |
Folding Seat Recline Motor Forward Control | B1785 0B | B1825 0A or 1 | -- | -- |
Folding Seat Recline Motor Rearward Control | B1785 0B | B1825 0A or 1 | -- | -- |
Folding Seat Rotation Motor Forward Control | B1547 0B | B1548 0A or 1 | -- | -- |
Folding Seat Rotation Motor Rearward Control | B1547 0B | B1548 0A or 1 | -- | -- |
Low Reference | -- | B1548 0A, B1825 0A, B2375 0A | -- | -- |
1. Power Third Row Seat Inoperative |
The rear seat module (RSM) monitors the position the rear folding seat motors by using hall effect position sensors which are an internal part of each motor. The RSM supplies each sensor with a 12-volt reference signal circuit and a low reference circuit. During seat operation, while the motor is active, each sensor provides the RSM with a single feedback pulse through the respective signal circuits for every rotation of the motor shaft. The RSM counts the feedback pulses from each sensor to determine seat position and end of travel limits for each of the seat motors.
• | DTC B1325 must not be present. |
• | Battery voltage must be between 9-16 volts. |
• | The seat adjuster motor must be active. |
The RSM does not detect position sensor movement or pulse signals while the adjuster motor is active. The following conditions will set this DTC:
• | An open, short to ground, or short to battery voltage in the position sensor signal circuit. |
• | An open in the position senor low reference circuit. |
• | An open in one of the seat motor control circuits. |
• | Current and history codes are set. |
• | If the seat is moving when this condition occurs, the operation will be aborted. |
• | While this condition exists all switch inputs will be ignored. |
The RSM will clear the current DTC whenever a stow switch is activated and the RSM receives pulse signals from the position sensor while the motor is active.
Power Seats System Description and Operation
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the RSM. |
⇒ | If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the RSM. |
⇒ | If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the RSM. |
⇒ | If the test lamp remains OFF during either of the commands, test for a short to ground or an open/high resistance on either control circuit. If the circuits test normal, replace the RSM. |
Important: After performing this diagnostic test and electrical or component repairs have been completed, the folding seat will be in an unknown state and out of calibration with the RSM. 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 RSM replacement, setup, and programming |