Possible Causes

An impact sensor status fault can be caused by:

damaged wiring, terminals or connectors.
a faulty impact sensor.
incorrect sensor mounting.
RCM is faulted.

NOTE:

Most faults are due to connector and/or wiring concerns. Carry out a thorough Inspection and Verification before proceeding with the Pinpoint Test.

DTC B2296 - RESTRAINT SYSTEM - IMPACT SENSOR FAULT - PINPOINT TEST REFERENCE

PINPOINT TEST 8		DTC B2296 - RESTRAINT SYSTEM - IMPACT SENSOR FAULT
STEP	INSPECTION		ACTION
1	CHECK FOR A HARD OR INTERMITTENT DTC WARNING: Restraint system diagnostic tools are for service only. Tools must be removed prior to operating the vehicle over the road. Failure to remove restraint system diagnostic tools could result in injury and possible violation of vehicle safety standards. WARNING: Never probe the connectors on the air bag module. Doing so can result in air bag deployment, which can result in personal injury. WARNING: The safety belt pretensioner is a pyrotechnic device. Always wear safety glasses when repairing an air bag equipped vehicle and when handling a safety belt buckle pretensioner or safety belt retractor pretensioner. Never probe a pretensioner electrical connector. Doing so could result in pretensioner or air bag deployment and could result in personal injury. WARNING: Never probe the electrical connector on a safety canopy module. Doing so can result in safety canopy deployment. NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer. Enter the following diagnostic mode on IDS or equivalent tester On-Demand Self-Test/Retrieve and Record Continuous Memory DTCs Enter the following diagnostic mode on IDS or equivalent tester View and Record DTC B2296 Fault PIDs Was on-demand DTC B2296 retrieved?	Yes	This is a hard fault. The fault condition is still present. This fault cannot be cleared until it is corrected and the DTC is no longer retrieved during the on-demand self-test. Using the fault PIDs recorded, GO to the appropriate pinpoint test step. For LH front impact severity sensor with a mounting/communications fault, Go to next step. For LH front impact severity sensor with an internal fault, INSTALL a new front impact severity sensor. See FRONT IMPACT SEVERITY SENSOR , . Go to Step 14.
1		No	This is an intermittent fault when present as a continuous memory DTC only (DTC not retrieved on demand). The fault condition is not present at this time. Go to step 13.
2	INSPECT THE LH FRONT IMPACT SEVERITY SENSOR MOUNTING, MOUNTING BRACKET AND MOUNTING SURFACE Key in OFF position. Depower the system. See DEPOWERING AND REPOWERING , . Inspect the LH front impact severity sensor mounting and make sure that the retaining bolt is fully seated and tightened correctly. Remove the LH front impact severity sensor. See FRONT IMPACT SEVERITY SENSOR , . Visually inspect the LH front impact severity sensor, mounting bracket and mounting surface for damage, corrosion or dirt. Was a significant amount of corrosion or dirt found, the LH front impact severity sensor mounting bracket attached to the mounting surface incorrectly or was the LH front impact severity sensor bolt not fully seated and tightened correctly?	Yes	CLEAN, TIGHTEN the bolt or REPAIR the mounting surface as necessary. REINSTALL the LH front impact severity sensor. Go to step 14.
2		No	Go to next step.
3	INSTALL THE LH FRONT IMPACT SEVERITY SENSOR AND CARRY OUT THE ON-DEMAND SELF TEST Clean and repair the mounting surface as necessary. Clean the LH front impact severity sensor mounting bolt. Install the LH front impact severity sensor. See FRONT IMPACT SEVERITY SENSOR , . Repower the system. Do not prove out the system at this time. See DEPOWERING AND REPOWERING , Enter the following diagnostic mode on IDS or equivalent tester: On-Demand Self-Test/Retrieve and Record Continuous Memory DTCs Enter the following diagnostic mode on IDS or equivalent tester: View and Record DTC B2296 Fault PIDs Was on-demand DTC B2296 retrieved?	Yes	Go to next step.
3		No	Fault corrected. Go to step 14.
4	CHECK THE LH FRONT IMPACT SEVERITY SENSOR GROUND CIRCUIT (Y/GY) FOR HIGH RESISTANCE Key in OFF position. Depower the system. See DEPOWERING AND REPOWERING , . Disconnect: LH Front Impact Severity Sensor connector 0810-105 Measure the resistance between LH front impact severity sensor connector 0810-105 pin 2, circuit (Y/GY), harness side and the LH front impact severity sensor case ground. Is the resistance less than 10 ohms?	Yes	Go to step 6.
4		No	Go to next step.
5	CLEAN THE LH FRONT IMPACT SEVERITY SENSOR MOUNTING SURFACE AND CARRY OUT THE ON-DEMAND SELF TEST Remove the LH front impact severity sensor. See FRONT IMPACT SEVERITY SENSOR , . Clean and repair the mounting surface as necessary. Clean the LH front impact severity sensor mounting bolts. Install the LH front impact severity sensor. See FRONT IMPACT SEVERITY SENSOR , . Repower the system. Do not prove out the system at this time. See DEPOWERING AND REPOWERING , . Enter the following diagnostic mode on IDS or equivalent tester: On-Demand Self-Test/Retrieve and Record Continuous Memory DTCs Enter the following diagnostic mode on IDS or equivalent tester: View and Record DTC B2296 Fault PIDs Was on-demand DTC B2296 retrieved?	Yes	Go to next step.
5		No	Fault corrected. Go to step 14.
6	CHECK CIRCUIT (V/G) AND CIRCUIT (Y/GY) FOR A SHORT TO VOLTAGE BETWEEN THE RCM AND LH FRONT IMPACT SEVERITY SENSOR Key in OFF position. Depower the system. See DEPOWERING AND REPOWERING , . Disconnect: LH Front Impact Severity Sensor connector 0810-105 Disconnect: RCM connectors 0810-101b and 0810-101a Repower the system. Do not prove out the system at this time. See DEPOWERING AND REPOWERING , . Key in ON position. Measure the voltage between LH front impact severity sensor connector 0810-105 pin 1, circuit (V/G), harness side and ground; and between LH front impact severity sensor connector 0810-105 pin 2, circuit (Y/GY), harness side and ground. Are the voltages less than 0.2 volt?	Yes	Go to next step.
6		No	REPAIR circuit (V/G) or circuit (Y/GY). Go to step 14.
7	CHECK CIRCUIT (V/G) AND CIRCUIT (Y/GY) FOR A SHORT TO GROUND BETWEEN THE RCM AND LH FRONT IMPACT SEVERITY SENSOR Key in OFF position. Depower the system. See DEPOWERING AND REPOWERING , . Measure the resistance between LH front impact severity sensor connector 0810-105 pin 1, circuit (V/G), harness side and ground; and between LH front impact severity sensor connector 0810-105 pin 2, circuit (Y/GY), harness side and ground. Are the resistances greater than 1,000,000 ohms?	Yes	Go to next step.
7		No	REPAIR circuit (V/G) or circuit (Y/GY). Go to See step 14.
8	CHECK CIRCUIT (V/G) FOR AN OPEN BETWEEN THE RCM AND LH FRONT IMPACT SEVERITY SENSOR Measure the resistance between RCM connector 0810-101a pin 19, circuit (V/G), harness side and LH front impact severity sensor connector 0810-105 pin 1, circuit (V/G), harness side. Is the resistance less than 0.5 ohm?	Yes	Go to next step.
8		No	REPAIR circuit (V/G). Go to step 14.
9	CHECK CIRCUIT (Y/GY) FOR AN OPEN BETWEEN THE RCM AND LH FRONT IMPACT SEVERITY SENSOR Measure the resistance between RCM connector 0810-101a pin 20, circuit (Y/GY), harness side and LH front impact severity sensor connector 0810-105 pin 2, circuit (Y/GY), harness side. Is the resistance less than 0.5 ohm?	Yes	Go to next step.
9		No	REPAIR circuit (Y/GY). Go to step 14.
10	CHECK CIRCUIT (V/G) FOR A SHORT TO CIRCUIT (Y/GY) BETWEEN THE RCM AND LH FRONT IMPACT SEVERITY SENSOR Measure the resistance between LH front impact severity sensor connector 0810-105 pin 1, circuit (V/G), harness side and connector 0810-105 pin 2, circuit (Y/GY), harness side. Is the resistance greater than 1,000,000 ohms?	Yes	Go to next step.
10		No	REPAIR circuit (V/G) and circuit (Y/GY). Go to step 14.
11	CHECK THE LH FRONT IMPACT SEVERITY SENSOR Connect: RCM connectors 0810-101 b and 0810-101 a Install a known good LH front impact severity sensor. Repower the system. Do not prove out the system at this time. See DEPOWERING AND REPOWERING , Enter the following diagnostic mode on the IDS or equivalent tester. On-Demand Self-Test/Retrieve and Record Continuous Memory DTCs Enter the following diagnostic mode on the IDS or equivalent tester: View and Record DTC B2296 Fault PIDs Were any on-demand fault PIDs for the LH front impact severity sensor indicating a fault?	Yes	Go to next step.
11		No	Fault corrected. Go to step 14.
12	CONFIRM THE RCM FAULT NOTE: Make sure all restraint system diagnostic tools, sensor electrical connectors and the RCM electrical connector are connected before carrying out the on-demand self-test. If not, erroneous DTCs will be recorded. Key in OFF position. Depower the system. See DEPOWERING AND REPOWERING , . Install the original sensor. Repower the system. Do not prove out the system at this time. See DEPOWERING AND REPOWERING , . Enter the following diagnostic mode on the IDS or equivalent tester: On-Demand Self-Test/Retrieve and Record Continuous Memory DTCs Enter the following diagnostic mode on the IDS or equivalent tester: View and Record DTC B2296 Fault PIDs Was on-demand DTC B2296 retrieved?	Yes	INSTALL a new RCM. See RESTRAINTS CONTROL MODULE (RCM) , . Go to step 14.
12		No	CHECK for causes of the intermittent fault. ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition key frequently. REPAIR any intermittent concerns found. Go to step 14.
13	CHECK FOR AN INTERMITTENT FAULT Key in OFF position. Enter the following diagnostic mode on the IDS or equivalent tester: On-Demand Self-Test/Retrieve and Record Continuous Memory DTCs Enter the following diagnostic mode on the IDS or equivalent tester: View and Record DTC B2296 Fault PIDs Was on-demand DTC B2296 retrieved?	Yes	This is a hard fault. The fault condition is now present. The fault cannot be cleared until it is corrected and the DTC is no longer retrieved during the on-demand self-test. CHECK for causes of the intermittent fault at or near the affected impact sensor connector. REPAIR any intermittent concerns found. If an intermittent concern was found and repaired, Go to next step. If an intermittent concern was not found and repaired, USE the fault PIDs recorded and GO to the appropriate pinpoint test step. For LH front impact severity sensor with a mounting/communications fault, Go to step 2. For LH front impact severity sensor with an internal fault, INSTALL a new front impact severity sensor. See FRONT IMPACT SEVERITY SENSOR , . Go to next step.
13		No	VISUALLY INSPECT the affected impact sensor, mounting brackets and mounting surface for damage, corrosion or dirt. INSPECT the wiring, terminals and connectors for damage, corrosion or dirt. CHECK for causes of the intermittent fault. ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition key frequently. ACTIVATE other systems in the same wire harness. REPAIR any intermittent concerns found. Goto next step.
14	CHECK FOR ADDITIONAL DTCs Refer to the continuous memory DTCs recorded during Step 1. Were any continuous memory DTCs retrieved during Step 1 ?	Yes	Do not clear any DTCs until all DTCs have been resolved. See DIAGNOSTIC TROUBLE CODE (DTC) INDEX - RESTRAINTS CONTROL MODULE (RCM) , for pinpoint test direction.
14		No	RECONNECT the system. If previously directed to deactivate the system, REACTIVATE the system. See SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEACTIVATION AND REACTIVATION , . REPOWER the system. See DEPOWERING AND REPOWERING , . PROVE OUT the system. CLEAR all RCM and OCS module DTCs.