Power Seats Diagnosis

Diagnostic Chart:

Schematic:

CIRCUIT DESCRIPTION
Battery positive voltage (B+) is supplied to the memory seat module (MSM) via CKT 1840 (ORN). The MSM monitors this voltage to determine if it is within a valid operating range.

CONDITIONS FOR SETTING THE DTC
The battery positive voltage (B+) level rises above 15.5 volts for more than approximately 1.2 seconds.

Action Taken When the DTC Set
^ Stores a DTC B1982 in the MSM memory.
^ The MSM will not respond to any manual or memory inputs when the voltage is greater than 16 volts.
^ No driver warning message will be displayed for this DTC.
^ The MSM switch failure and position sensor failure DTCs will not set while DTC B1982 is current.

CONDITIONS FOR CLEARING THE DTC
^ The battery positive voltage (B+) level falls below 15 volts for approximately 1.2 seconds.
^ Use the On-Boards clearing DTCs feature.
^ Use a scan tool.

DIAGNOSTIC AIDS
This DTC may set when the vehicle is placed on a battery charger, on fast charge, for a long period of time.

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 Checks that DTC was not set erroneously.
3 Determines whether the malfunction is in the charging system or the memory seat module (MSM).
5 Clear all DTCs after the repair procedure is complete.