Normal Operation

The restraints control module (RCM) monitors the driver seat track position sensor circuits. If the RCM detects a short to battery, it will store DTC C1981 in memory and send a message to the instrument cluster module to illuminate the air bag warning indicator. If the RCM detects a short to battery on the driver seat track position sensor circuit, it sets DTC C1981 Front Driver's Seat Track Position Switch Circuit Fault.

This pinpoint test is intended to diagnose the following:

Wiring, terminals or connectors
RCM
WARNING:
- Remove restraint system diagnostic tools from the vehicle prior to road testing. If tools are not removed, the supplemental restraint system (SRS) device may not deploy in a crash. Failure to follow this instruction may result in serious personal injury or death in a crash and possibly violate vehicle safety standards.
WARNING:
- Never probe the electrical connectors on safety belt buckle/retractor pretensioners or adaptive load limiting retractors. Failure to follow this instruction may result in the accidental deployment of the safety belt pretensioners or adaptive load limiting retractors, which increases the risk of serious personal injury or death.
CAUTION:
- Use the correct probe adapter(s) when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE:
- The supplemental restraint system (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.
NOTE:
- SRS components should only be disconnected or reconnected when instructed to do so within a pinpoint test step. Failure to follow this instruction may result in incorrect diagnosis of the SRS.
NOTE:
- Most faults are due to connector and/or wiring concerns. Carry out a thorough Inspection and Verification before proceeding with the Pinpoint Test.

DIAGNOSIS PROCEDURE - FRONT DRIVER'S SEAT TRACK POSITION SWITCH CIRCUIT FAULT

PINPOINT TEST 20		DTC C1981 - FRONT DRIVER'S SEAT TRACK POSITION SWITCH CIRCUIT FAULT
STEP	INSPECTION		ACTION
1	CHECK FOR AN INTERMITTENT AND ON-DEMAND DTC Enter the following diagnostic mode on integrated diagnostic system (IDS) or equivalent tester: RCM Self Test/Retrieve and Record On-Demand and Continuous Memory DTCs Was on-demand DTC C1981 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.
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 4.
2	CHECK CIRCUIT (Y/V) FOR A SHORT TO VOLTAGE Key in OFF position. Depower the SRS. See DEPOWERING AND REPOWERING . Disconnect: RCM connectors 0810-101b and 0810-101 a. Disconnect: Driver Seat Track Position Sensor connector 0810-112. Repower the SRS. Do not prove out the SRS at this time. See DEPOWERING AND REPOWERING . Key in ON position. Measure the voltage between driver seat track position sensor connector 0810-112 pin 2, circuit (Y/V), harness side and ground. Is the voltage less than 0.2 volt?	Yes	Go to next step.
2		No	REPAIR circuit (Y/V). Go to step 5.
3	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 SRS. See DEPOWERING AND REPOWERING . Connect: RCM connectors 0810-101b and 0810-101 a. Driver Seat Track Position Sensor connector 0810-112. 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: RCM Self Test/Retrieve and Record On-Demand and Continuous Memory DTCs Was on-demand DTC C1981 retrieved?	Yes	INSTALL a new RCM. See RESTRAINTS CONTROL MODULE (RCM) . Go to step 5.
3		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. Do not install any new SRS components at this time. SRS components should only be installed when directed to do so in the pinpoint test. REPAIR any intermittent concerns found. Go to step 5.
4	CHECK FOR AN INTERMITTENT FAULT Key in OFF position. Enter the following diagnostic mode on IDS or equivalent tester: RCM Self Test/Retrieve and Record On-Demand and Continuous Memory DTCs Was on-demand DTC C1981 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.
4		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. Do not install any new SRS components at this time. SRS components should only be installed when directed to do so in the pinpoint test. REPAIR any intermittent concerns found. Go to next step.
5	CHECK FOR ADDITIONAL SRS DTCs WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment. Reconnect all SRS components (If previously disconnected). If previously directed to depower the SRS, repower the SRS. Do not prove out the SRS at this time. See DEPOWERING AND REPOWERING . Enter the following diagnostic mode on IDS or equivalent tester: Self Test/Retrieve and Record RCM On-Demand and Continuous Memory DTCs Enter the following diagnostic mode on IDS or equivalent tester: Clear all RCM/OCSM Continuous Memory DTCs Enter the following diagnostic mode on IDS or equivalent tester: Self Test/RCM Are any RCM DTCs retrieved indicating a fault?	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.
5		No	PROVE OUT the SRS. REPAIR is complete. RETURN the vehicle to the customer.