DTC 43: SRS Warning Light Drive Circuit System Fault 1 (Light does not Illuminate.): 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 Tools:

MB991502: Scan Tool (MUT-II)
MB991223 (MB991222): Harness Set (Probe)

STEP 1. Check the SRS warning light.
1. Disconnected the SRS-ECU connector C-137.
2. Connect the negative battery terminal.
3. Turn the ignition switch to the "ON" position.
Q: Does the warning light illuminate?

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 5.

NO: Go to Step 2.

Fig 1: Identifying SRS-ECU Connector C-137
Courtesy of DAIMLERCHRYSLER CORPORATION
STEP 2. Check the ground line at the SRS-ECU connector C-137.
1. Disconnect the SRS-ECU connector C-137.
  
  Fig 2: Identifying SRS-ECU Connector C-137
  Courtesy of DAIMLERCHRYSLER CORPORATION
  
  CAUTION: Do not insert a test probe into the terminal from its front side directly as the connector contact pressure may be weakened.
2. Measure the continuity between the C-137 harness side connector terminal 3 and ground.
  It should be less than 2 ohms.
Q: Does continuity exist?

YES : Go to Step 3.

NO: Go to Step 4.

Fig 3: Measuring Continuity Between C-137 Harness Side Connector Terminal 3 And Ground
Courtesy of DAIMLERCHRYSLER CORPORATION
STEP 3. Check the harness wires for open circuit between the ignition switch connector C-202 (terminal No.2) and the combination meter C-101 (terminal No.12), and between the combination meter C-101 (terminal No.8) and the SRS-ECU connector C-137 (terminal No.4).
NOTE: After inspecting the intermediate connectors C-101, C-308 and C-311, inspect the wiring harness. If the intermediate connector C-101, C-308, or C-311 is damaged, repair or replace it. Refer to , HARNESS CONNECTOR INSPECTION . Then go to Step 5.

Fig 4: Identifying Connector C-101
Courtesy of DAIMLERCHRYSLER CORPORATION

Fig 5: Identifying Connectors C-308, C-311
Courtesy of DAIMLERCHRYSLER CORPORATION

Q: Are the harness wires between the SRS-ECU connector C-137 (terminal No.4) and the ignition switch connector C-202 (terminal No.2) in good condition?

YES : Replace the combination meter (Refer to COMBINATION METERS ASSEMBLY AND VEHICLE SPEED SENSOR ). Then go to Step 5.

NO: Repair the harness wires between the SRS-ECU connector C-137 and the ignition switch connector C-202. Then go to Step 5.

Fig 6: Identifying Connector C-137
Courtesy of DAIMLERCHRYSLER CORPORATION

Fig 7: Identifying Connector C-202
Courtesy of DAIMLERCHRYSLER CORPORATION
STEP 4. Check the harness wire for open circuit between the SRS-ECU connector C-137 (terminal No.3) and ground.
Q: Is the harness wire between the SRS-ECU connector C-137 (terminal No.3) and ground in good condition?

YES : Go to Step 5.

NO: Repair the harness wire between the SRS-ECU connector C-137 and ground. Then go to Step 5.

Fig 8: Identifying Connector C-137
Courtesy of DAIMLERCHRYSLER CORPORATION

Fig 9: Identifying Center Reinforcement
Courtesy of DAIMLERCHRYSLER CORPORATION
STEP 5. 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 ).