PINPOINT TEST I: DTCs C1280, C1282, C1963, C1975, U0074, U0151 and U0452

WARNING: Never probe the electrical connectors on air bag, Safety Canopy® 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.

WARNING: Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors. Failure to follow this instruction may result in the accidental deployment of the safety belt pretensioners, adaptive load limiting retractors, or safety belt inflators, which increases the risk of serious personal injury or death.

NOTE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.

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

I1 CHECK FOR A HS-CAN COMMUNICATION CONCERN WITH THE RCM
- Connect the scan tool.
- Ignition ON.
- Using the scan tool, carry out the Network Test.
- Does the RCM pass the Network Test?
- Yes : GO to I2.
- No : REFER to MODULE COMMUNICATIONS NETWORK article to diagnose the High Speed Controller Area Network (HS-CAN) bus.

I2 CHECK THE CAN CIRCUITS FOR AN OPEN

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.

Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
Disconnect: ABS Module C135.
Disconnect: RCM C310B.

Measure the resistance between the ABS module C135, harness side and the RCM C310B, harness side as indicated in the following chart:

ABS Module	Circuit	RCM
C135-37	VCA23 (BU/WH)	C310B-20
C135-24	VCA24 (GN/OG)	C310B-19

Fig 1: Measuring Resistance Between ABS Module C135, Harness Side And RCM C310B, Harness Side

Courtesy of FORD MOTOR CO.

Are the resistances less than 5 ohms?

Yes : GO to I3.
No : REPAIR the affected circuits. CLEAR the DTCs. REPEAT the self-test. GO to I10.

I3 CHECK THE CAN CIRCUITS FOR A SHORT TO GROUND
- Measure the resistance between ground and:
  - ABS module C135-24, circuit VCA24 (GN/OG), harness side.
  - ABS module C135-37, circuit VCA23 (BU/WH), harness side.
    
    Fig 2: Measuring Resistance Between ABS Module C135-24, Circuit VCA24 (GN/OG), Harness Side
    Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10, 000 ohms?
- Yes : GO to I4.
- No : REPAIR the affected circuits. CLEAR the DTCs. REPEAT the self-test. GO to I10.
I4 CHECK THE CAN CIRCUITS FOR A SHORT TOGETHER
- Measure the resistance between ABS module C135-24, circuit VCA24 (GN/OG), harness side and ABS module C135-37, circuit VCA23 (BU/WH), harness side.
  
  Fig 3: Measuring Resistance Between ABS Module C135-24, Circuit VCA24 (GN/OG) And ABS Module C135-37, Circuit VCA23 (BU/WH), Harness Side
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10, 000 ohms?
- Yes : GO to I5.
- No : REPAIR the affected circuits. CLEAR the DTCs. REPEAT the self-test. GO to I10.
I5 CHECK THE CAN CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition ON.
- Measure the voltage between ground and:
  - ABS module C135-24, circuit VCA24 (GN/OG), harness side.
  - ABS module C135-37, circuit VCA23 (BU/WH), harness side.
    
    Fig 4: Measuring Voltage Between Ground And ABS Module C135-24, Circuit VCA24 (GN/OG), Harness Side
    Courtesy of FORD MOTOR CO.
- Is any voltage present?
- Yes : REPAIR the affected circuits. CLEAR the DTCs. REPEAT the self-test. GO to I10.
- No : GO to I6.
I6 CHECK RCM TERMINATING RESISTOR
- Ignition OFF.
- 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 RCM in SUPPLEMENTAL RESTRAINT SYSTEM article.
  - repair any concerns found. Refer to SYSTEM WIRING DIAGRAMS article, Connector Repair Procedures for schematic and connector information.
- Connect: RCM C310B.
- Measure the resistance between ABS module C135-37, circuit VCA23 (BU/WH), harness side and C135-24, circuit VCA24 (GN/OG), harness side.
  
  Fig 5: Measuring Resistance Between ABS Module C135-37, Circuit VCA23 (BU/WH) And C135-24, Circuit VCA24 (GN/OG), Harness Side
  Courtesy of FORD MOTOR CO.
- Is the resistance between 108 and 132 ohms?
- Yes : GO to I7.
- No : GO to I8.
I7 CHECK THE ABS MODULE FOR CORRECT OPERATION
- 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 CPA lever/lock for correct operation. Refer to RCM in SUPPLEMENTAL RESTRAINT SYSTEM article.
  - inspect ABS module C135 for dirt, corrosion, water intrusion, pushed-out, loose or spread terminals and loose or frayed wire connections at terminals.
  - repair any concerns found. Refer to SYSTEM WIRING DIAGRAMS article, Connector Repair Procedures for schematic and connector information.
- Connect: All Previously Disconnected Component(s)/Connector(s).
- Repower the SRS. Do not prove out the SRS at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING in SUPPLEMENTAL RESTRAINT SYSTEM article.
- Enter the following diagnostic mode on the scan tool: Self Test - ABS Module.
- Was DTC U0151 retrieved on-demand during the self-test?
- Yes : INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE in this service information. GO to I10.
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. GO to I10.
I8 CONFIRM THE RCM FAULT
NOTE: Make sure all restraint system components, sensor electrical connectors and the RCM electrical connectors are connected before carrying out the self-test. If not, DTCs will be recorded.
- If previously directed to repower the SRS, depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING in SUPPLEMENTAL RESTRAINT SYSTEM article.
- 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 CPA lever/lock for correct operation. Refer to RCM Removal and Installation in SUPPLEMENTAL RESTRAINT SYSTEM article.
  - inspect ABS module C135 for dirt, corrosion, water intrusion, pushed-out, loose or spread terminals and loose or frayed wire connections at terminals.
  - repair any concerns found. Refer to SYSTEM WIRING DIAGRAMS article, Connector Repair Procedures for schematic and connector information.
- Connect: All Previously Disconnected Component(s)/Connector(s).
- Repower the SRS. Do not prove out the SRS at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING in SUPPLEMENTAL RESTRAINT SYSTEM article.
- Enter the following diagnostic mode on the scan tool: Self Test - RCM.
- Were DTCs U0028:08 and/or U0028:88 retrieved on-demand during self-test?
- Yes : INSTALL a new RCM. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article. GO to I10.
- No : In the process of diagnosing the fault, the fault condition has become intermittent.
  CHECK for causes of the intermittent fault. ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition frequently. ACTIVATE other systems in the same wire harness. 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 I9.
I9 CHECK FOR AN INTERMITTENT FAULT
- Ignition OFF.
- Depower the SRS. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING in SUPPLEMENTAL RESTRAINT SYSTEM article.
- Disconnect RCM C310B and ABS module C135:
  - 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 SYSTEM WIRING DIAGRAMS article, Connector Repair Procedures for schematic and connector information.
- Connect: All Previously Disconnected Component(s)/Connector(s).
- Repower the SRS. Do not prove out the SRS at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING in SUPPLEMENTAL RESTRAINT SYSTEM article.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - RCM.
- Are any RCM DTCs retrieved on-demand during the self-test?
- Yes : REFER to DIAGNOSIS AND TESTING in SUPPLEMENTAL RESTRAINT SYSTEM article.
- 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 I10.
I10 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 not prove out the SRS at this time. Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING in SUPPLEMENTAL RESTRAINT SYSTEM article.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - Clear all CMDTCs.
- Enter the following diagnostic mode on the scan tool: Self Test - ABS Module.
- Were any DTCs retrieved on-demand from the RCM or ABS module during self-test?
- Yes : Do not clear any DTCs until all DTCs have been resolved. GO to the appropriate DTC CHART in this service information and/or SUPPLEMENTAL RESTRAINT SYSTEM article for pinpoint test direction.
- No : CLEAR all CMDTCs. PROVE OUT the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING in SUPPLEMENTAL RESTRAINT SYSTEM article.
  Repair is complete. RETURN the vehicle to the customer.