Possible Causes

A driver seat track position sensor open circuit fault can be caused by:

damaged wiring, terminals or connectors.
a faulty driver seat track position sensor.
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 C1946 - FRONT DRIVER'S SEAT TRACK POSITION SWITCH CIRCUIT OPEN - PINPOINT TEST REFERENCE

PINPOINT TEST 17		DTC C1946 - FRONT DRIVERS SEAT TRACK POSITION SWITCH CIRCUIT OPEN
STEP	INSPECTION		ACTION
4	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 Was on-demand DTC C1946 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. Go to next step.
4		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 6.
2	CHECK CIRCUIT (Y/V) FOR AN OPEN BETWEEN THE RCM AND DRIVER SEAT Key in OFF position. Depower the system. See DEPOWERING AND REPOWERING , . Disconnect: RCM connectors 0810-101b and 0810-101a. Disconnect: Seat Track Position Sensor connector 0810-112. Measure the resistance between RCM connector 0810-101a pin 23, circuit (Y/V), harness side and driver seat track position sensor connector 0810-112 pin 2, circuit (Y/V). Is the resistance less than 0.5 ohm?	Yes	Go to next step.
2		No	REPAIR circuit (Y/V). Go to step 7.
3	CHECK CIRCUIT (B/L) FOR AN OPEN TO GROUND Measure the resistance between driver seat track position sensor connector 0810-112 pin 1, circuit (B/L) and ground. Is the resistance less than 0.5 ohm?	Yes	Go to next step.
3		No	REPAIR circuit (B/L). Go to step 7.
4	CHECK THE SEAT TRACK POSITION SENSOR Connect: RCM connectors 0810-101 b and 0810-101 a Install a known good driver seat track position 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 Was on-demand DTC C1946 retrieved?	Yes	Go to next step.
4		No	Fault corrected. Goto step 7.
5	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 , . Reinstall the original seat track position 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 Was on-demand DTC C1946 retrieved?	Yes	INSTALL a new RCM. See RESTRAINTS CONTROL MODULE (RCM) , . Go to step 7.
5		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 7.
6	CHECK FOR AN INTERMITTENT FAULT Key in OFF position. Enter the following diagnostic mode on IDS or equivalent tester: On-Demand Self-Test / Retrieve and Record Continuous Memory DTCs Was on-demand DTC C1946 retrieved?	Yes	This is a hard fault. The fault condition is now present. This fault cannot be cleared until it is corrected and the DTC is no longer retrieved during the on-demand self-test. Go to step 2.
6		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 next step.
7	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.
7		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.