[52B] SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - - TROUBLESHOOTING - DIAGNOSTIC TROUBLE CODE PROCEDURES - Diagnosis code 67: Driver's Seat Belt Pre-Tensioner (Squib) System Fault for Earth Circuit (Short-Circuited to Earth) | PRINT PAGE / INDEX / PRIOR / NEXT

Diagnosis code 67: Driver's Seat Belt Pre-Tensioner (Squib) System Fault for Earth Circuit (Short-Circuited to Earth)
OPERATION The SRS-ECU judges how severe a collision is by detecting signals from the front impact sensors and the front air bag analog G-sensor. If the impact is over a predetermined level, the SRS-ECU outputs an ignition signal. At this time, if the front air bag safing G-sensor is on, the pre-tensioner will deploy.
DIAGNOSIS CODE SET CONDITIONS This diagnosis code is set if there is abnormal resistance between the input terminals of the driver's seat belt pre-tensioner (squib).
PROBABLE CAUSES Damaged wiring harnesses or connectors Short to the earth in the driver's seat belt pre-tensioner (squib) harness Malfunction of the SRS-ECU
| DIAGNOSIS PROCEDURE
| STEP 1. Check the driver's seat belt pre-tensioner (Check whether the diagnosis code is reset). Disconnect the negative battery terminal.
| Disconnect driver's seat belt pre-tensioner connector D-29 <2400> or D-43 <2000>. Use a flat-tipped screwdriver to pull out the locking button at the harness side connector, and then disconnect the connector.
| Connect special tool dummy resistor (MB991865) to special tool resistor harness (MB991884). Connect special tool MB991884 to the D-29 <2400> or D-43 <2000> harness side connector. Connect the negative battery terminal. Erase diagnosis code memory, and check the diagnosis code. Q: Is diagnosis code 67 set? YES: Go to Step 2. NO: Replace the driver's seat belt pre-tensioner (Refer to ). Then go to Step 4.
| STEP 2. Check the driver's seat belt pre-tensioner circuit at the SRS-ECU connector C-114. Disconnect SRS-ECU connector C-114.
| Disconnect driver's seat belt pre-tensioner connector D-29 <2400> or D-43 <2000>. Use a flat-tipped screwdriver to pull out the locking button at the harness side connector, and then disconnect the connector.
| CAUTION Do not insert a test probe into the terminal from its front side directly as the connector contact pressure may be weakened. Check for continuity between C-114 harness side connector terminals No.29, 30 <except 2400 (RH drive vehicles)>, No.27, 28 <2400 (RH drive vehicles)> and body earth. OK: Open circuit Q: Is the check result normal? YES: Erase the diagnosis code memory, and check the diagnosis code. If diagnosis code 67 sets, replace the SRS-ECU (Refer to ). Then go to Step 4 . NO: Go to Step 3.
| STEP 3. Check harness wires for short circuit to earth between SRS-ECU connector C-114 (terminal No.29 and 30 <except 2400 (RH drive vehicles)>, No.27 and 28 <2400 (RH drive vehicles)>). and driver's seat belt pre-tensioner connector D-29 <2400> or D-43 2000> (terminal No.1 and 2). NOTE: After inspecting intermediate connector D-31 <2400 (LH drive vehicles)>, D-50 <2400 (RH drive vehicles)>, C-13 <2000>, inspect the wiring harness. If the intermediate connector D-31 <2400 (LH drive vehicles)>, D-50 <2400 (RH drive vehicles)>, C-13 <2000> is damaged, repair or replace it. Then go to Step 4. Q: Are the harness wires between SRS-ECU connector C-114 (terminal No.29 and 30 <except 2400 (RH drive vehicles)>, No.27 and 28 <2400 (RH drive vehicles)>). and driver's seat belt pre-tensioner connector D-29 <2400> or D-43 <2000> (terminal No.1 and 2) in good condition? YES: Go to Step 4. NO: Repair the harness wires between SRS-ECU connector C-114 and driver's seat belt pre-tensioner connector D-29 <2400> or D-43 <2000>. Then go to Step 4.
| STEP 4. Check whether the diagnosis code is reset. Q: Is diagnosis code 67 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 GROUP 00 - How to Use Troubleshooting/Inspection Service Points .

[52B] SUPPLEMENTAL RESTRAINT SYSTEM (SRS) - - TROUBLESHOOTING - DIAGNOSTIC TROUBLE CODE PROCEDURES - Diagnosis code 67: Driver's Seat Belt Pre-Tensioner (Squib) System Fault for Earth Circuit (Short-Circuited to Earth) | PRINT PAGE / INDEX / PRIOR / NEXT

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