B1982 & B1983 MSM

DTCs B1982 And B1983:

CIRCUIT DESCRIPTION
Memory Seat Module (MSM) power is supplied through CKT 1340, referenced to ground CKT 450. The MSM contains an internal analog to digital (A/D) converter which is used to convert this battery voltage to a digital value accurate to 0.1 volt. This digital value is checked to see if it is below 9.0 volts or above 15.5 volts. A Diagnostic Trouble Codes (DTC) will be set if either case is present.

CONDITIONS FOR SETTING THE DTCS
^ This check is made at least every 300 milliseconds. An over or under voltage condition must be present for a minimum of 1200 milliseconds before the DTC will be set. This period effectively eliminates noise from causing nuisance DTCs.
^ These diagnostics will not he run while the CRANK condition is true or for two seconds following any CRANK condition.

ACTION TAKEN WHEN THE DTC SETS
These DTCs will disable most of the remaining MSM DTCs. This DTC detects when the voltage at the module reaches a level where the module can no longer function properly. This DTC may set if the vehicle is placed on a battery charger.

CONDITIONS FOR CLEARING THE MIL/DTC
This DTC will be automatically cleared when the module voltage rises above 9.5 volts or below 15.0 volts for a period of 1200 milliseconds.

TEST DESCRIPTION
The numbers below refer to step numbers on the diagnostic table.
2. Checks MSM battery input voltage value.
4. Checks for proper battery voltage at the circuit breaker.