DTC 43: SRS Warning Light Drive Circuit System Fault 1 (Light does not Go out.): Diagnosis

WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.

Required Special Tool:

MB991502: Scan Tool (MUT-II)

STEP 1. Check SRS-ECU connector C-137 for damage.
1. Disconnect SRS-ECU connector C-137.
2. Check the short spring for the warning light inside the harness side connector for improper contact or deformation.
Q: Is SRS-ECU connector C-137 in good condition?

YES : Then go to Step 2.

NO: Repair or replace the SRS-ECU connector C-137. Then go to Step 4.

Fig 1: Identifying Connector C-137
Courtesy of DAIMLERCHRYSLER CORPORATION

Fig 2: Identifying C-72 SRS-ECU Connector
Courtesy of DAIMLERCHRYSLER CORPORATION
STEP 2. Check the SRS warning light.
1. Disconnect the SRS-ECU connector C-137.
  
  Fig 3: Identifying Connector C-137
  Courtesy of DAIMLERCHRYSLER CORPORATION
  
  CAUTION: Insert an insulator such as a cable tie to a depth of 4mm (0.16 inch) or more, otherwise the short spring will not be released.
2. Insert a cable tie [3 mm (0.12 inch) wide, 0.5 mm (0.02 inch) thick] between the terminals 3, 4 and the short spring to release the short spring.
3. Connect the negative battery cable.
4. Turn the ignition switch to the "ON" position.
Q: Does the SRS warning light go out?

YES : Erase the DTC memory, and recheck if any DTC sets. If DTC 43 sets, replace the SRS-ECU (Refer to SRS CONTROL UNIT (SRS-ECU) ). Then go to Step 4.

NO: Go to Step 3.

Fig 4: Inserting Cable Tie Between Connector C-137 Terminals
Courtesy of DAIMLERCHRYSLER CORPORATION
STEP 3. Check the harness wire for short circuit to ground between the SRS-ECU connector C-137 (terminal No.4) and the combination meter connector C-101 (terminal No.8).
Q: Is the harness wire between the SRS-ECU connector C-137 (terminal No.4) and the combination meter connector C-101 (terminal No.8) in good condition?

YES : Replace the combination meter (Refer to COMBINATION METERS ASSEMBLY AND VEHICLE SPEED SENSOR ). Then go to Step 4.

NO: Repair the harness wire between the SRS-ECU connector C-137 and the combination meter connector C-101. Then go to Step 4.

Fig 5: Identifying Connector C-137
Courtesy of DAIMLERCHRYSLER CORPORATION

Fig 6: Identifying Connector C-101
Courtesy of DAIMLERCHRYSLER CORPORATION
STEP 4. Check for DTC.
Q: Is DTC 43 set?

YES : Return to Step 1.

NO: The procedure is complete (If no malfunctions are found in all steps, an intermittent malfunction is suspected. Refer to TO COPE WITH INTERMITTENT MALFUNCTION ).