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 falls below 9 volts for approximately 1.2 seconds or more.
Action Taken When the DTC Sets
| • | Stores a DTC B1983 in the MSM memory. |
| • | The MSM will not respond to any manual or memory inputs when the voltage is less than 9 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 B1983 is current. |
Conditions for Clearing the DTC
| • | The battery positive voltage (B+) level rises above 9.5 volts for approximately 1.2 seconds. |
| • | Use the On-Boards clearing DTCs feature. |
| • | Use a scan tool. |
Diagnostic Aids
The MSM will not check for low battery positive voltage (B+) during and for 2 seconds following the engine CRANK mode. This ensures that DTC B1983 will not erroneously set.
Test Description
The numbers below refer to the step numbers on the diagnostic table:
-
Perform the entire Power Seat Systems Diagnostic System Check before continuing with the diagnosis of this DTC.
-
Checks that DTC was not set erroneously.
-
Determines whether the malfunction is in the charging system or the Memory Seat Module (MSM).
-
Clear all DTCs after the repair procedure is complete.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Was the entire Power Seat Systems Diagnostic System Check performed? | -- | |||
Is the battery positive voltage (B+) level greater than the specified value? | 9 V | |||
Is the voltage less than the specified value? | 9 V | Go to Charging System Check in Engine Electrical | ||
4 | Replace the Memory Seat Module (MSM). Refer to Memory Seat Control Module Replacement . Is the MSM replacement complete? | -- | -- | |
Are all DTCs cleared? | -- | -- |
