B2112

Circuit Description

The memory seat module (MSM) receives an input from the left lumbar switch when the up switch is actuated. When the lumbar switch is operated in the up direction, battery positive voltage (B+) is supplied to the MSM lumbar up input via CKT 387 (RED). The MSM recognizes the input and moves the lumbar support in the up direction.

Conditions for Setting the DTC

^ When the lumbar up switch is active for 30 seconds after motion has ceased, the switch is considered shorted and the DTC sets.
^ If the lumbar vertical position sensor DTC B2120 is current and the lumbar up switch is active for 30 seconds, the switch is considered shorted and the DTC sets.
^ DTC B2112 sets only if DTC B1982 MSM or DTC B1983 MSM is not current.

Action Taken When the DTC Sets

^ The MSM does not move the lumbar support in the up direction.
^ The MSM continues to respond to valid inputs from the other manual switches.
^ All memory recall function commands are ignored for all directions.

Conditions for Clearing the DTC

^ The MSM recognizes that the lumbar up switch is no longer active.
^ Use the on-boards clearing DTCs feature.
^ Use a scan tool.

Test Description

The numbers below refer to the step numbers on the diagnostic table:

1. Perform the entire Power Seat Systems Diagnostic System Check before continuing with the diagnosis of this DTC.
2. This step determines if a switch is stuck or if a short to battery positive voltage (B+) exists in the wiring input to the memory seat module (MSM). DTC B2112 will set again if a short in the wiring exists or if an internal MSM problem exists. DTC B2112 will not set again if a switch is stuck because the switch has been disconnected from the memory seat module (MSM) input.
3. This step determines if a short to battery positive voltage (B+) exists in the input wiring to the MSM.
7. Clear all DTCs after the repair procedure is complete.