WARNING: If the supplemental restraint system (SRS) is being serviced, the system must be deactivated and restraint system diagnostic tools must be installed. Refer to Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) in this section.
The air bag restraint system diagnostic tools must be removed and the air bag modules reconnected when the system is reactivated to avoid non-deployment in a collision, resulting in possible personal injury.
NOTE: Diagnostics or repairs are not to be performed on a seat equipped with a seat side air bag with the seat in the vehicle. Prior to attempting to diagnose or repair a seat concern when equipped with a seat side air bag, the seat must be removed from the vehicle and the restraint system diagnostic tools must be installed in the seat side air bag electrical connectors. The restraint system diagnostic tools must be removed prior to operating the vehicle over the road.
NOTE: After diagnosing or repairing an SRS, the restraint system diagnostic tools must be removed before operating the vehicle over the road.
NOTE: After diagnosing or repairing a seat system, the restraint system diagnostic tools must be removed before operating the vehicle over the road.
NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
Deactivate the system. Refer to Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) in the Diagnosis and Testing portion of this section.
Inspect the front impact severity sensor mounting and make sure that the retaining bolts are fully seated and tightened correctly.
Remove the front impact severity sensor. Refer to Crash Sensor—Front .
Visually inspect the front impact severity sensor, mounting bracket and mounting surface for damage, corrosion or dirt.
- Was a significant amount of corrosion or dirt found, the front impact severity sensor mounting bracket attached to the mounting surface incorrectly or were the front impact severity sensor bolts not fully seated and tightened correctly?
CLEAN, TIGHTEN bolts or REPAIR the mounting surface as necessary. REINSTALL the front impact severity sensor. GO to J34 .
No
GO to J23 .
J23 INSTALL THE FRONT IMPACT SEVERITY SENSOR AND CARRY OUT ON-DEMAND SELF TEST
Clean and repair the mounting surface as necessary.
Clean the front impact severity sensor mounting bolts.
Install the front impact severity sensor. Refer to Crash Sensor—Front .
FLAG DTC B2296 / Retrieve and record any flagged faults for use later in this pinpoint test.
- Was DTC B2296 retrieved during the on-demand self test?
GO to J24 .
No
Fault corrected. GO to J34 .
J24 CHECK THE FRONT IMPACT SEVERITY SENSOR GROUND CIRCUIT 618 (VT/LG) FOR HIGH RESISTANCE
Front Impact Severity Sensor C177
/ Measure the resistance between the front impact severity sensor C177 pin 1, circuit 618 (VT/LG), harness side and the front impact severity sensor case ground.
- Is the resistance less than 100 ohms?
GO to J26 .
No
GO to J25 .
J25 CLEAN THE FRONT IMPACT SEVERITY SENSOR MOUNTING SURFACE AND CARRY OUT ON-DEMAND SELF-TEST
Remove the front impact severity sensor. Refer to Crash Sensor—Front .
Clean and repair the mounting surface as necessary.
Clean the front impact severity sensor mounting bolts.
Install the front impact severity sensor. Refer to Crash Sensor—Front .
FLAG DTC B2296 / Retrieve and record any flagged faults for use later in this pinpoint test.
- Was DTC B2296 retrieved during the on-demand self test?
GO to J26 .
No
Fault corrected. GO to J34 .
J26 CHECK CIRCUITS 617 (PK/OG) AND 618 (VT/LG) FOR A SHORT TO GROUND BETWEEN THE RCM AND THE FRONT IMPACT SEVERITY SENSOR
RCM C310a
RCM C310b
/ Measure the resistance between the front impact severity sensor C177 pin 2, circuit 617 (PK/OG), harness side and ground; and between the front impact severity sensor C177 pin 2, circuit 618 (VT/LG), harness side and ground.
- Are the resistances greater than 1,000,000 ohms?
GO to J27 .
No
REPAIR circuit 617 (PK/OG) or 618 (VT/LG).GO to J34 .
J27 CHECK CIRCUITS 617 (PK/OG) AND 618 (VT/LG) FOR A SHORT TO VOLTAGE BETWEEN THE RCM AND THE FRONT IMPACT SEVERITY SENSOR
/ Measure the voltage resistance between the front impact severity sensor C177 pin 2, circuit 617 (PK/OG), harness side and ground; and between the front impact severity sensor C177 pin 1, circuit 618 (VT/LG), harness side and ground.
- Are the voltages less than 0.2 volt?
GO to J28 .
No
REPAIR circuit 617 (PK/OG) or 618 (VT/LG). GO to J34 .
J28 CHECK FOR AN OPEN ON CIRCUIT 617 (PK/OG) BETWEEN THE RCM AND THE FRONT IMPACT SEVERITY SENSOR
/ Measure the resistance between the RCM C310b pin 19, circuit 617 (PK/OG), harness side and the front impact severity sensor C177 pin 2, circuit 617 (PK/OG), harness side.
- Is the resistance less than 0.5 ohm?
GO to J29 .
No
REPAIR circuit 617 (PK/OG). GO to J34 .
J29 CHECK FOR AN OPEN ON CIRCUIT 618 (VT/LG) BETWEEN THE RCM AND THE FRONT IMPACT SEVERITY SENSOR
/ Measure the resistance between the RCM C310b pin 20, circuit 618 (VT/LG), harness side and the front impact severity sensor C177 pin 1, circuit 618 (VT/LG), harness side.
- Is the resistance less than 0.5 ohm?
GO to J30 .
No
REPAIR circuit 618 (VT/LG). GO to J34 .
J30 CHECK CIRCUIT 617 (PK/OG) FOR A SHORT TO CIRCUIT 618 (VT/LG) BETWEEN THE RCM AND THE FRONT IMPACT SEVERITY SENSOR
/ Measure the resistance between the RCM C310b pin 19, circuit 617 (PK/OG), harness side and the front impact severity sensor C177 pin 1, circuit 618 (VT/LG), harness side.
- Is the resistance greater than 1,000,000 ohms?
GO to J31 .
No
REPAIR circuits 617 (PK/OG) and 618 (VT/LG). GO to J34 .
J31 CHECK THE FRONT IMPACT SEVERITY SENSOR
RCM C310a
RCM C310b
Install a known good front impact severity sensor.
On-Demand Self Test
FLAG DTC B2296 / Retrieve and record any flagged faults for use later in this pinpoint test.
- Were any faults flagged against the front impact severity sensor?
INSTALL the original front impact severity sensor. GO to J32 .
No
Fault corrected. GO to J34 .