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 Descriptor
DTC 022: Swivel In Limit Switch Remains Active After Start of Rotation OutDTC 023: Swivel Out Limit Becomes Active Before Rotation Out Is Complete.
DTC 025: Swivel Out Limit Switch Does Not Become Active After 13 Seconds of Outward Rotation
DTC 031: Swivel In Limit Switch Active at Start of Rotation In
DTC 032: Swivel Out Limit Switch Remains Active After Start Rotation In
DTC 033: Swivel In Limit Switch Becomes Active Before Rotation In Is Complete
DTC 035: Swivel In Limit Switch Does Not Become Active After 13 Seconds of Inward Rotation
DTC 041: Lift Lower Limit Switch Active at Start of Descend
DTC 042: Lift Upper Limit Switch Remains Active After Start or Descend
DTC 043: Lift Lower Limit Switch Does Not Become Active After 35 Seconds of Descend
DTC 051: Lift Upper Limit Switch Remains Active After Start or Descend
DTC 052: Lift Lower Limit Switch Remains Active After Start of Ascend
DTC 053: Lift Upper Limit Switch Does Not Become Active After 80 Seconds of Ascend
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Swivel Out Limit Switch Signal | 023,025,032 | -- | -- | -- |
Swivel Inside Limit Switch Signal | 022,035,033,031 | -- | -- | -- |
Lift Lower Limit Switch Signal | 041,043,052 | -- | -- | -- |
Lift Upper Limit Switch Signal | 042,051,053 | -- | -- | -- |
Sensors Ground | -- | 022, 023, 025, 031, 032, 033, 035, 041, 042, 043, 051, 052, 053 | -- | -- |
Circuit/System Description
The mobility seat module uses inputs from 4 limit switches in order to determine the seat position. The limit switch signal circuits are referenced from battery voltage within the module. The limit switches will open or close the switch signal circuits to ground in order for the module to determine them to be active or inactive. The swivel out limit switch signal circuit is considered to be active when the circuit reference voltage is low or closed to ground by the switch. The mobility seat module also monitors an input from a hall effect sensor in the rotation motor while the seat is being rotated in or out. The hall effect is a 12-volt 3-wire sensor and the signal circuit is referenced from battery voltage within the module.
Conditions for Running the DTC
| • | Battery voltage must be within 9-16 volts. |
| • | Seat rotation out operation is attempted. |
Conditions for Setting the DTC
DTC 022
After rotation out operation has been in progress for 1 second from the forward facing position the swivel in limit switch signal to the module remains high or active.
DTC 023
When rotating the seat to the outward position the swivel out limit switch becomes active before the hall effect sensor input indicates that the seat has rotated to the full outward facing position.
DTC 025
While attempting to rotate the seat outward from the forward facing position the time from the swivel in limit switch becoming inactive to the swivel out switch becoming active exceeds 13 seconds.
DTC 031
When the seat is operated to the inward facing position from the outward facing position the swivel in limit switch signal to the module is high or active.
DTC 032
After rotation inward operation has been in progress for 1 second from the outward facing position the swivel out limit switch signal to the module remains low or active.
DTC 033
When rotating the seat to the forward facing position the swivel in limit switch becomes active before the hall effect sensor input indicates that the seat has rotated to the full forward facing position.
DTC 035
While attempting to rotate the seat inward from the outward facing position the time from the swivel out limit switch becoming inactive to the swivel in switch becoming active exceeds 13 seconds.
DTC 041
When seat descend operation is attempted from the outward facing in vehicle position the lift lower limit switch signal to the module is low or active.
DTC 042
After descend operation has been in progress for 1 second from the outward facing in vehicle position the lift upper limit switch signal to the module remains high or active.
DTC 043
While attempting to descend the seat from the outward facing in vehicle position the time from the lift upper limit switch becoming inactive to the lift lower switch becoming active exceeds 35 seconds.
DTC 051
When seat ascend operation is attempted from the out of vehicle position the lift upper limit switch signal to the module is high or active.
DTC 052
After seat ascend operation has been in progress for 1 second from the out of vehicle position the lift lower limit switch signal to the module remains low or active.
DTC 053
While attempting to ascend the seat from the out of vehicle position the time from the lift lower limit switch becoming inactive to the lift upper switch becoming active exceeds 80 seconds.
Action Taken When the DTC Sets
| • | While the fault is current the module will not allow the seat to complete outward. |
| • | The module will allow the seat to be returned up and in the forward facing position in 3-second intervals. |
Conditions for Clearing the DTC
The DTC may be cleared by removing the main power supply or ground from the seat module.
Diagnostic Aids
Inspect the limit switch for any physical damage or obstructions to its mechanical operation which may cause the condition.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Sit-N-Lift Mobility Seat Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module Referencesfor scan tool information
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the appropriate limit switch.
- Test for less than 1 ohm between the ground circuit terminal 1 and ground.
- Ignition ON, test for greater than 3 volts between the appropriate signal circuit terminal and ground:
- If all circuits test normal, test or replace the swivel inside limit switch.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| • | Swivel inside limit switch or lift upper limit switch - terminal 3 |
| • | Swivel outside limit switch or lift lower limit switch - terminal 2 |
| ⇒ | If less than specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit test normal, replace the seat control module. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
