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DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHRYSLER1999300M V6-3.5L VIN GREPAIR AND DIAGNOSISRELAYS AND MODULESRELAYS AND MODULES - BODY AND FRAMESEAT TEMPERATURE CONTROL MODULETECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSHEATED SEAT AND MIRROR MEMORY MODULE - FALSE DTC'S
1999 Chrysler 300M V6-3.5L VIN G
Heated Seat and Mirror Memory Module - False DTC's
1999 Chrysler 300M V6-3.5L VIN GSECTION Heated Seat and Mirror Memory Module - False DTC's
NO: 08-23-98
GROUP: Electrical
DATE: May 22, 1998
SUBJECT:
Memory Heated Seat &
Mirror Module Erroneous
Diagnostic Trouble Code
MODELS:
1999 (LH) LHS/300M
SYMPTOM/CONDITION:
When the M1 fuse is pulled out or blown with the ignition in the "ON" position, and the ignition is then turned off, the Memory Heated Seats & Mirror Module (MHSMM) does not receive an ignition "OFF" message from the Body Control Module (BCM), This will set four erroneous faults in the process. Memory recall will also be disabled until a good M1 fuse has been reinstalled or the ignition is turned to the "ON" position.
DISCUSSION:
The four faults set by the MHSMM, as read with a DRB III(R), will be the "Ignition Status Fault," the "PRNDL Message Fault, and both "Left and Right Seat Output Shorted Fault." All are due to the lack of bus communication from the BCM to the MHSMM when the M1 fuse is not present or blown. To correct this condition, perform the following steps:
1. Verify that there is a good Mi fuse installed and functional.
2. Clear all MHSMM DTC's.
3. Start the vehicle and let run for one minute and check if any of the above four DTC's have been set in the MHSMM.
4. If any of the above DTC's are present, or any other non-related DTC's have been set, follow the repair procedure outlined in the 1999 LHS/300M service manual (Publication No. 81-270-8140A) section 8R and 8N and the 1998 Concorde/Intrepid, 1999 LHS/300M body diagnostic procedure's manual (Publication No. 81-699-97229).
5. If no DTC's have been set, verify memory recall and heater operation with the ignition "ON."
POLICY: Information Only
GROUP: Electrical
DATE: May 22, 1998
SUBJECT:
Memory Heated Seat &
Mirror Module Erroneous
Diagnostic Trouble Code
MODELS:
1999 (LH) LHS/300M
SYMPTOM/CONDITION:
When the M1 fuse is pulled out or blown with the ignition in the "ON" position, and the ignition is then turned off, the Memory Heated Seats & Mirror Module (MHSMM) does not receive an ignition "OFF" message from the Body Control Module (BCM), This will set four erroneous faults in the process. Memory recall will also be disabled until a good M1 fuse has been reinstalled or the ignition is turned to the "ON" position.
DISCUSSION:
The four faults set by the MHSMM, as read with a DRB III(R), will be the "Ignition Status Fault," the "PRNDL Message Fault, and both "Left and Right Seat Output Shorted Fault." All are due to the lack of bus communication from the BCM to the MHSMM when the M1 fuse is not present or blown. To correct this condition, perform the following steps:
1. Verify that there is a good Mi fuse installed and functional.
2. Clear all MHSMM DTC's.
3. Start the vehicle and let run for one minute and check if any of the above four DTC's have been set in the MHSMM.
4. If any of the above DTC's are present, or any other non-related DTC's have been set, follow the repair procedure outlined in the 1999 LHS/300M service manual (Publication No. 81-270-8140A) section 8R and 8N and the 1998 Concorde/Intrepid, 1999 LHS/300M body diagnostic procedure's manual (Publication No. 81-699-97229).
5. If no DTC's have been set, verify memory recall and heater operation with the ignition "ON."
POLICY: Information Only
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.