B1845

DTC B1845

CIRCUIT DESCRIPTION
The power lumbar switches are inputs to the driver and passenger seat modules. The seat modules supply the switch assemblies with a battery positive switch supply circuit and monitor 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 lumbar switch assembly. When battery voltage is present on the switch signal circuit the seat module determines the switch status to be active.

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 power lumbar 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.

Steps 1 - 9:

TEST