PINPOINT TEST Y: DTCs B1317, B1318, U3003:16 and U3003:17

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Do not handle, move or change the original horizontal mounting position of the restraints control module (RCM) while the RCM is connected and the ignition switch is ON. Failure to follow this instruction may result in the accidental deployment of the Safety Canopy® and cause serious personal injury or death.

WARNING: Always tighten the fasteners of the restraints control module (RCM) and impact sensor (if equipped) to the specified torque. Failure to do so may result in incorrect restraint system operation, which increases the risk of personal injury or death in a crash.

NOTE: 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.

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

Y1 RETRIEVE ALL CMDTCs IN ALL MODULES
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - ALL CMDTC (Continuous Memory).
- Is DTC B1317, B1318, B1676, U3003:16 or U3003:17 present in one or more modules AND P0563, P0620, P0625, P0626 or P065B retrieved from the PCM?
- Yes: REFER to CHARGING SYSTEM to diagnose the charging system.
- No: GO to Y2 .
Y2 TEST BATTERY CONDITION
- Ignition OFF.
- Carry out the battery condition test. Refer to BATTERY, MOUNTING AND CABLES .
- Did battery pass the condition test?
- Yes: If the battery passed the condition test but required a recharge, REFER to CHARGING SYSTEM to diagnose the charging system. CLEAR all CMDTCs . TEST the system for normal operation.
  If the battery passed the condition test and did not require a recharge, GO to Y3 .
- No: INSTALL a new battery. CLEAR all CMDTCs . TEST the SRS for normal operation.
Y3 CHECK CHARGING SYSTEM VOLTAGE
NOTE: Do not allow the engine speed to increase above 2,000 RPM while performing this step or the generator may self excite and result in default charging system output voltage. If engine speed goes above 2,000 RPM, shut the vehicle OFF and restart the engine before performing this step.
- Measure the voltage of the battery:
  - For DTC B1317 or U3003:17, turn off all accessories and run the engine at 1,500 RPM for a minimum of 2 minutes while measuring battery voltage.
  - For DTC B1318 or U3003:16, turn on headlights and HVAC fan on high and run engine at 1,500 RPM for a minimum of 2 minutes while measuring battery voltage.
    
    Fig 1: Measuring Voltage Of Battery
    Courtesy of FORD MOTOR CO.
- Is the voltage between 13 and 15.2 volts?
- Yes: For DTC B1318 or U3003:16, GO to Y4 .
  For DTC B1317 or U3003:17, GO to Y6.
- No: REFER to CHARGING SYSTEM to diagnose the charging system. CLEAR all CMDTCs . TEST the SRS for normal operation.
Y4 CHECK FOR OPEN IGNITION CIRCUIT TO THE MODULE
- Ignition OFF.
- Depower the SRS . Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
- Disconnect the module with the concern:
  - For the RCM , disconnect C2041A and C2041B.
  - For the Occupant Classification System Module (OCSM), disconnect C3285.
- Measure the resistance of the ignition circuit:
  - For the RCM , measure the resistance between RCM C2041a-13, circuit CBP31 (BU/OG), harness side and Smart Junction Box (SJB) fuse 31.
  - For the OCSM , measure the resistance between OCSM C3285-1, circuit CBP46 (WH/BU), harness side and SJB fuse 46.
- Is the resistance less than 1 ohm?
- Yes: GO to Y5 .
- No: REPAIR the circuit as necessary. CLEAR all CMDTCs . TEST the SRS for normal operation.
Y5 CHECK FOR OPEN GROUND TO THE MODULE
- Measure the resistance of the ground circuit:
  - For the RCM , measure the resistance between the RCM case and a good ground.
  - For the OCSM , measure the resistance between OCSM C3285- 14, circuit GD183 (BK/WH), harness side and ground.
- Is the resistance less than 1 ohm?
- Yes: GO to Y6 .
- No: For the RCM , MAKE SURE there is no corrosion between the RCM case and mounting. MAKE SURE the fasteners are clean and tightened to specification with no corrosion. REPAIR as necessary.
  For the OCSM , REPAIR circuit GD183 (BK/WH) as necessary.
  
  CLEAR all CMDTCs . TEST the SRS for normal operation.
Y6 CHECK FOR MODULE OPERATION
- Depower the SRS . Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
- Disconnect the module with the concern:
  - For the RCM , disconnect C2041A and C2041B.
  - For the OCSM , disconnect C3285.
- Check for the following:
  - corrosion.
  - damaged pins.
  - pushed-out pins.
- Connect the RCM C2041A and C2041B or OCSM C3285 and make sure the connector seats correctly.
- Repower the SRS . Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING .
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes: INSTALL a new module. REFER to RESTRAINTS CONTROL MODULE (RCM) or OCCUPANT CLASSIFICATION SENSOR - ORIGINAL EQUIPMENT or OCCUPANT CLASSIFICATION SENSOR - SERVICE KIT .
- No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR all CMDTCs . TEST the SRS for normal operation.