DTC 75: Side-Airbag Module (RH) (Squib) System Fault Power Supply Circuit (Short-Circuited to Power Supply): 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)
MB991865: Dummy Resistor
MB991866: Resistor Harness
MB991223 (MB991222): Harness Set (Probe)

STEP 1. Check the side-airbag module (RH).
1. Disconnect the negative battery terminal.
2. Disconnect the side-airbag module (RH) connector D-24.
  
  Fig 1: Identifying Connector D-24
  Courtesy of DAIMLERCHRYSLER CORPORATION
3. Connect special tool MB991865 to special tool MB991866.
  CAUTION: Do not insert a test probe into the terminal from its front side directly as the connector contact pressure may be weakened.
4. Insert special tool MB991866 into the D-24 harness side connector by backprobing.
5. Connect the negative battery terminal.
6. Erase the DTC memory, and then recheck the DTC.
Q: Is DTC 75 set?

YES : Go to Step 2.

NO: Replace the seatback assembly of the front seat (RH) (Refer to FRONT SEAT ASSEMBLY ). Then go to Step 3.

Fig 2: Identifying Dummy Resistor
Courtesy of DAIMLERCHRYSLER CORPORATION
STEP 2. Check the side-airbag module (RH) circuit at the SRS-ECU connector C-145.
1. Disconnect the SRS-ECU connector C-145.
  
  Fig 3: Identifying Connector C-145
  Courtesy of DAIMLERCHRYSLER CORPORATION
  
  WARNING: To prevent the side-airbag from deploying unintentionally, disconnect the side-airbag module (RH) connector D-24 to short the squib circuit.
2. Disconnect the side-airbag module (RH) connector D-24.
3. Turn the ignition switch to the "ON" position.
  
  Fig 4: Identifying Connector D-24
  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.
4. Measure the voltage between the C-145 harness side connector terminals 23 and 24 and body ground. Voltage should be 0 volt.
Q: Is the measured voltage within the specified range?

YES : Erase the DTC memory, and recheck if any DTC sets. If DTC 75 sets, replace the SRS-ECU (Refer to SRS CONTROL UNIT (SRS-ECU) ). Then go to Step 4.

NO: Go to Step 3.

Fig 5: Measuring Voltage Between C-145 Harness Side Connector Terminals 23 And 24 And Body Ground
Courtesy of DAIMLERCHRYSLER CORPORATION
STEP 3. Check the harness wires for short circuit to power supply between the SRS-ECU connector C-145 (terminal No.23 and 24) and the side-airbag module (RH) connector D-24 (terminal No.1 and 2).
Q: Are the harness wires between the SRS-ECU connector C-145 (terminal No.23 and 24) and the side-airbag module (RH) connector D-24 (terminal No.1 and 2) in good condition?

YES : Go to Step 4.

NO: Repair the harness wires between the SRS-ECU connector C-145 and the side-airbag module (RH) connector D-24. Then go to Step 4.

Fig 6: Identifying Connector C-145
Courtesy of DAIMLERCHRYSLER CORPORATION

Fig 7: Identifying Connector D-24
Courtesy of DAIMLERCHRYSLER CORPORATION
STEP 4. Check for DTC.
Q: Is DTC 75 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 ).