OPERATION
When the lumbar control switch is actuated, a battery feed and a ground path are applied through the switch contacts to the power lumbar support adjuster motor. The lumbar support adjuster motor operates the lumbar support adjuster mechanism through its drive unit in the selected direction until the switch is released, or until the travel limit of the adjuster is reached. When the switch is moved in the opposite direction, the battery feed and ground path to the motor are reversed through the switch contacts. This causes the power lumbar support adjuster motor to run in the opposite direction.
On vehicles equipped with the memory seat system, the driver memory seat switch provides a resistive signal/input to the Memory Seat Module (MSM). The MSM is responsible for the 12 volt battery feed and ground path to the power lumbar support adjuster motor.
The lumbar control switch should NOT be held applied in any direction after the adjuster has reached its travel limit. The power lumbar support adjuster motor contains a self-resetting circuit breaker to protect it from overload. However, consecutive or frequent resetting of the circuit breaker may result in motor damage.
The lumbar control switch cannot be adjusted or repaired and must be replaced if damaged or inoperative.
When one of the two buttons of the memory seat switch is pressed, the Memory Seat Module (MSM) receives the memory set/position switch input over the Controller Area Network (CAN) bus. The MSM also receives hard wired input from the hall effect sensors, mounted on each of the driver power seat adjuster motors and driver side power rear view mirror motors. The programmed software in the MSM allows it to know where the seat and mirror are located in there designed travel by a pulse count generated from the hall effect sensors. This way, when a memory seat switch button is pressed, the MSM will power the seat adjuster motors and mirror adjuster motors until the correct preset locations are achieved. The MSM will prevent the seat memory recall function from being initiated whenever the transmission gear selector lever is not in the Park position, or if the vehicle is moving. These inputs are monitored over the CAN bus by the MSM.
The memory seat switch is diagnosed using a scan tool. Refer to DIAGNOSIS AND TESTING ).
The memory seat switch cannot be adjusted or repaired and must be replaced if damaged or inoperative.
When a power seat switch is actuated, a battery feed and a ground path are applied through the switch contacts to the selected power seat adjuster or recliner adjuster motor. The selected seat adjuster motor operates to move the seat or recliner through its drive unit in the selected direction until the switch is released, or until the travel limit of the adjuster is reached. When the switch is moved in the opposite direction, the battery feed and ground path to the motor are reversed through the switch contacts. This causes the seat adjuster motor to run in the opposite direction.
On vehicles equipped with the memory seat system, the driver memory seat switch provides a resistive signal/input to the Memory Seat Module (MSM). The MSM is responsible for the 12 volt battery feed and ground path to the power seat adjuster motors.
No power seat switch should be held applied in any direction after the adjuster has reached its travel limit. The power seat adjuster motors each contain a self-resetting circuit breaker to protect them from overload. However, consecutive or frequent resetting of the circuit breaker may result in motor damage.
The individual switches in the power seat switch cannot be adjusted or repaired. If a switch is damaged or inoperative, the entire power seat switch must be replaced.
Scheme 131
- Disconnect and isolate the battery negative cable.
- Remove the power seat switch from the seat. Refer to «SWITCH, Seat, Power , Removal»(ref-457831-S13627103862012030200000) .
- Use an ohmmeter to test the continuity of the power seat switch using the following table. If not OK, replace the inoperative power seat switch. If switch tests OK, check for an open or short in the power seat circuit wiring. If no open or short is found, replace the power adjuster motor(s) as required.
| SWITCH POSITION | CONTINUITY BETWEEN |
|---|---|
| OFF | 7-1, 7-3, 7-4, 7-5, 7-8, 7-9, 7-10, 7-11 |
| RECLINER UP | 6-3, 7-1, 7-4, 7-5, 7-8, 7-9, 7-10, 7-11 |
| RECLINER DOWN | 6-1, 7-3, 7-4, 7-5, 7-8, 7-9, 7-10, 7-11 |
| HORIZONTAL FORWARD | 6-8, 7-1, 7-3, 7-4, 7-5, 7-9, 7-10, 7-11 |
| HORIZONTAL REARWARD | 6-4, 7-1, 7-3, 7-5, 7-8, 7-9, 7-10, 7-11 |
| FRONT TILT DOWN | 6-5, 7-1, 7-3, 7-4, 7-8, 7-9, 7-10, 7-11 |
| FRONT TILT UP | 6-9, 7-1, 7-3, 7-4, 7-5, 7-8, 7-10, 7-11 |
| REAR TILT DOWN | 6-10, 7-1, 7-3, 7-4, 7-5, 7-8, 7-9, 7-11 |
| REAR TILT UP | 6-11, 7-1, 7-3, 7-4, 7-5, 7-8, 7-9, 7-10 |
DRIVER SEAT SWITCH CONTINUITY - WITHOUT MEMORY
Scheme 132
- Disconnect and isolate the battery negative cable.
- Remove the power seat switch from the seat. Refer to «SWITCH, Seat, Power , Removal»(ref-457831-S13627103862012030200000) .
- Use an ohmmeter to test the continuity of the power seat switch using the following table. If not OK, replace the inoperative power seat switch. If switch tests OK, check for an open or short in the power seat circuit wiring. If no open or short is found, replace the power adjuster motor(s) as required.
| SWITCH POSITION | CONTINUITY BETWEEN | RESISTANCE VALUE |
|---|---|---|
| OFF | 10-4 | OPEN |
| OFF | 10-11 | OPEN |
| OFF | 1-4 | 47 OHMS |
| OFF | 1-11 | 47 OHMS |
| REAR TILT UP | 10-11 | 169 OHMS |
| REAR TILT DOWN | 10-11 | 76 OHMS |
| HORIZONTAL FORWARD | 10-11 | 43 OHMS |
| HORIZONTAL REARWARD | 10-11 | 10 OHMS |
| RECLINER UP | 10-4 | 43 OHMS |
| RECLINER DOWN | 10-4 | 10 OHMS |
| FRONT TILT UP | 10-4 | 169 OHMS |
| FRONT TILT DOWN | 10-4 | 76 OHMS |
| ALL RESISTANCE VALUES ARE ± FIVE PERCENT | ||
DRIVER SEAT SWITCH CONTINUITY - WITH MEMORY