Operation CHARM: Car repair manuals for everyone.
Home >> Ford Truck >> 2010 >> Transit Connect L4-2.0L >> Repair and Diagnosis >> Restraints and Safety Systems >> Air Bag Systems >> Testing and Inspection >> Pinpoint Tests >> Pinpoint Tests AV: DTC C1946

Pinpoint Tests AV: DTC C1946




Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS)

Pinpoint Tests

Pinpoint Test AV: DTC C1946

Refer to Wiring Diagram Set 46, Supplemental Restraint System for schematic and connector information. Diagrams By Number

Normal Operation

The Restraints Control Module (RCM) continuously monitors the driver seat track position sensor circuits. If the RCM detects a fault, it will store DTC C1946 in memory and send a message to the Instrument Cluster (IC) module to illuminate the air bag warning indicator.

- DTC C1946 (Front Driver's Seat Track Position Switch Circuit Open) - If the RCM detects a open on either driver seat track position sensor circuit, it will set this DTC.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Driver seat track position sensor
- RCM



PINPOINT TEST AV: DTC C1946

WARNING: Never probe the electrical connectors on air bag, Safety Canopy(R) or side air curtain modules. Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test. Inspection and Verification

NOTE: Supplemental Restraint System (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: Always make sure the correct SRS component is being installed. Parts released for other vehicles may not be compatible even if they appear physically similar. Check the part number listed in the Ford Catalog Advantage(TM) or equivalent to make sure the correct component is being installed. If an incorrect SRS component is installed, DTCs may set.

NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.

-------------------------------------------------
AV1 RETRIEVE RCM DTCs


NOTE: All RCM diagnosis will be carried out using Continuous Memory Diagnostic Trouble Codes (CMDTCs) and status information. Refer to DTC Fault Reporting and Status Information. DTC Fault Reporting and Status Information

- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - RCM.
- Select the DTC and view DTC Status information.
- Does the status information for DTC C1946 indicate a fault was present at the time of request?

Yes
This fault cannot be cleared until it is corrected and the DTC is no longer retrieved during the self-test. GO to AV2.

No
This is an intermittent fault. The DTC Status information indicates the fault was not present at time of request. GO to AV6.

-------------------------------------------------
AV2 CHECK THE DRIVER SEAT TRACK POSITION SENSOR


NOTE: This pinpoint test step will attempt to change the fault reported by the RCM by inducing a different fault condition. If the fault reported changes, this indicates the RCM is functioning correctly and is not the source of the fault.

- Ignition OFF.
- 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.
- Disconnect: Driver Seat Track Position Sensor C3207.
- Connect a fused jumper wire between driver seat track position sensor C3207-2, circuit 7-JA53 (YE/RD), harness side and C3207-1, circuit 9-JA53 (BN/RD), harness side.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - RCM.
- Select the DTC and view DTC Status information.
- DIAGNOSTIC TIP: When viewing DTCs with the driver seat track position sensor circuits shorted together, a short to ground fault would normally be retrieved.
- Does the status information for DTC C1946 indicate a fault was present at the time of request?

Yes
GO to AV3.

No
INSTALL a new driver seat track position sensor. REFER to Seat Position Sensor Service and Repair. GO to AV7.

-------------------------------------------------
AV3 CHECK THE DRIVER SEAT TRACK POSITION SENSOR CIRCUIT FOR AN OPEN


- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Disconnect: RCM C310A and C310B.
- Remover the fused jumper wire from the driver seat track position sensor C3207.
- Measure the resistance between RCM C310B-33, circuit 7-JA53 (YE/RD), harness side and driver seat track position sensor C3207-2, circuit 7-JA53 (YE/RD), harness side.




- Is the resistance less than 0.5 ohm?

Yes
GO to AV4.

No
REPAIR circuit 7-JA53 (YE/RD). GO to AV7.

-------------------------------------------------
AV4 CHECK THE DRIVER SEAT TRACK POSITION SENSOR RETURN CIRCUIT FOR AN OPEN


- Measure the resistance between RCM C310b-34, circuit 9-JA10 (BN/YE), harness side and driver seat track position sensor C3207-1, circuit 9-JA53 (BN/RD), harness side.




- Is the resistance less than 5 ohms?

Yes
GO to AV5.

No
REPAIR circuit 9-JA53 (BN/RD) and/or 9-JA10 (BN/YE). GO to AV7.

-------------------------------------------------
AV5 CONFIRM THE RCM FAULT


NOTE: Make sure all restraint system components and the RCM electrical connectors are connected before carrying out the self-test. If not, DTCs will be recorded.

- Ignition OFF.
- Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Prior to reconnecting any previously disconnected SRS component:
- inspect connector(s) (including any in-line connectors) for pushed-out, loose or spread terminals and loose or frayed wire connections at terminals.
- inspect wire harness for any damage, pinched, cut or pierced wires.
- inspect RCM C310A and C310B Connector Position Assurance (CPA) lever/lock for correct operation. Refer to Restraints Control Module (RCM) Service and Repair.
- repair any concerns found.
Refer to Wiring Diagram Set 5, Connector Repair Procedures for schematic and connector information. Diagrams By Number

- Connect: RCM C310A and C310B.
- Connect: Driver Seat Track Position Sensor C3207.
- Repower the SRS. Do not prove out the SRS at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - RCM.
- Select the DTC and view DTC Status information.
- Does the status information for DTC C1946 indicate a fault was present at the time of request?

Yes
INSTALL a new RCM. REFER to Restraints Control Module (RCM) Service and Repair. GO to AV7.

No
In the process of diagnosing the fault, the fault condition has become intermittent. 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. GO to AV6.

-------------------------------------------------
AV6 CHECK FOR AN INTERMITTENT FAULT


- Ignition OFF.
- 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.
- Disconnect driver seat track position sensor C3207:
- inspect connector(s) (including any in-line connectors) for corrosion, loose or spread terminals and loose or frayed wire connections at terminals.
- inspect wire harness for any damage, pinched, cut or pierced wires.
- repair any concerns found.
Refer to Wiring Diagram Set 5, Connector Repair Procedures for schematic and connector information. Diagrams By Number

- Connect: All Previously Disconnected Component(s)/Connector(s).
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - RCM.
- Select the DTC and view DTC Status information.
- Does the status information for DTC C1946 indicate a fault was present at the time of request?

Yes
The fault condition is now present. Do not clear any DTCs until all DTC concerns have been resolved. GO to AV2.

No
The fault is not present and cannot be recreated at this time. 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. GO to AV7.

-------------------------------------------------
AV7 CHECK FOR ADDITIONAL SRS DTCs


- Ignition OFF.
- 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 notprove out the SRS at this time. Refer to Supplemental Restraint System (SRS) Depowering and Repowering Supplemental Restraint System (SRS) Depowering and Repowering.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - Restraints.
- NOTE: When selecting Restraints from the Self Test menu, DTCs will be retrieved from the RCM and OCSM.
- Does the status information for any RCM DTC indicate a fault is present and/or are any OCSM on-demand DTCs retrieved?

Yes
Do not clear any DTCs until all DTC concerns have been resolved. GO to the DTC Charts for pinpoint test direction. Diagnostic Trouble Code Tests and Associated Procedures

No
CLEAR all RCM and OCSM CMDTCs. PROVE OUT the SRS. Repair is complete. RETURN the vehicle to the customer.

-------------------------------------------------

pro multis · About Operation CHARM