Circuit Description
The seat adjuster switches are inputs to the driver seat module (DSM). The seat module supplies the adjuster switch assembly with a battery positive switch supply circuit and monitors the switch signal circuits. In an inactive state the switch signal circuits are floating and when a switch is pressed the signal circuit is closed to the switch power circuit within the adjuster switch assembly. When battery voltage is present on the switch signal circuit the seat module determines the switch status to be active.
DTC Descriptors
This diagnostic procedure supports the following DTCs:
| • | DTC B1735 Driver Seat Front Up Switch Circuit |
| • | DTC B1740 Driver Seat Front Down Switch Circuit |
| • | DTC B1745 Driver Seat Rear Up Switch Circuit |
| • | DTC B1750 Driver Seat Rear Down Switch Circuit |
| • | DTC B1755 Driver Seat Assembly Forward Switch Circuit |
| • | DTC B1760 Driver Seat Assembly Rearward Switch Circuit |
| • | DTC B1815 Driver Seat Recline Forward Switch Circuit |
| • | DTC B1820 Driver Seat Recline Rearward Switch Circuit |
Conditions for Running the DTC
Battery voltage to the seat module must be within 7-16 volts.
Conditions for Setting the DTC
A switch signal circuit to the seat module is active for more than 60 seconds.
Action Taken When the DTC Sets
The seat module will disable the seat adjuster function for which the DTC has set.
Conditions for Clearing the DTC
| • | The DTC will be stored as a history code when the fault is no longer present. |
| • | A history DTC will be cleared after completing 100 consecutive ignition cycles. |
Diagnostic Aids
If the DTC is only found in history, the fault may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Driver Seat Schematics Connector End View Reference: Power Seat Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Does the scan tool display Inactive? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 | Disconnect the seat adjuster switch connector. Does the scan tool display Inactive? | Go to Step 5 | Go to Step 4 |
4 | Test the switch signal circuit for which the DTC has set for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 7 |
5 | Inspect for poor connections at the seat adjuster switch. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 6 |
6 | Replace the seat adjuster switch. Refer to Power Seat Switch Replacement . Is the repair complete? | Go to Step 9 | -- |
7 | Inspect for poor connections at the seat module. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 9 | Go to Step 8 |
8 | Replace the seat module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming . Is the repair complete? | Go to Step 9 | -- |
9 |
Does the DTC reset? | Go to Step 2 | System OK |
