LEMON Manuals: Even more car manuals for everyone
Home >> Ford >> 2000 >> Contour SE, 2.0 3, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 440 (Seating) >> Diagnosis And Testing >> Seats >> Symptom Chart >> Pinpoint Test U: DTC B1358 - Ignition Switch Or Blower Electronics Circuit Short To Ground/DTC B2521 - Tach Circuit Failure >> Overview

Pinpoint Test U: DTC B1358 - Ignition Switch Or Blower Electronics Circuit Short To Ground/DTC B2521 - Tach Circuit Failure: Overview

WARNING: This page is about a different car, the 2004 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
  1. U1 CHECK CIRCUIT 30-HC21 (RD/GN) OR CIRCUIT 30-HC22 (RD/YE) 
    WARNING: The restraint system diagnostic tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards.
    NOTE: If a seat equipped with a seat mounted side air bag and/or a safety belt pretensioner (if equipped) system is being serviced, the air bag system must be depowered. Refer to AIR BAG RESTRAINT SYSTEMS .
    NOTE: The air bag warning lamp illuminates when the RCM fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault.
    NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of AIR BAG RESTRAINT SYSTEMS .
    • Disconnect: Driver Seat Side Air Bag Module C316 or Passenger Seat Side Air Bag Module C314.
    • Connect: Restraint System Diagnostic Tool 418-133 or 501-097 to Driver Seat Side Air Bag Module C316 or Passenger Seat Side Air Bag Module C314.
    • Connect: Battery Ground Cable.
      • WARNING: Be sure that nobody is in the vehicle and that there is nothing blocking or set in front of any air bag module when the battery ground cable is connected.
    • Disconnect: Driver CCSM C3031a or Passenger CCSM C3036a.
    • Key in ON position.
    • Measure the voltage between driver CCSM C3031a-4, circuit 30-HC21 (RD/GN), harness side and ground or passenger CCSM C3036a-4, circuit 30-HC22 (RD/YE), harness side and ground.
      Fig 1: Measuring Voltage Between Driver CCSM C3031A-4, Circuit 30-HC21 (RD/GN), Harness Side And Ground
      G03203804Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to U2.
    2. No  : REPAIR the affected circuit. CLEAR the DTCs. REPEAT the self test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316 or passenger seat side air bag module C314. CONNECT driver seat side air bag module C316 or passenger seat side air bag module C314. REPOWER the supplemental restraint system (SRS). REFER to AIR BAG RESTRAINT SYSTEMS .
  2. U2 CHECK THE FAN MOTOR RPM INPUT 
    • Key in OFF position.
    • Connect: Driver CCSM C3031a or Passenger CCSM C3036a.
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: CCSM Active Command Menu TURN BLOWER FULL POWER.
      • NOTE: After the active command FULL BLOW is commanded to the ON state, the climate controlled seat blower fan will operate for 15 seconds then turn off.
    • NOTE: The CCSM is not the source of the fault if the active command mode is operational.
    • Monitor the PID BLWRRPM while commanding the FULL BLOW active command ON then OFF.
    • Does the PID value change when the climate controlled seat blower fan was commanded ON and OFF? 
    1. Yes  : CHECK for causes of the intermittent fault. INSPECT the connectors, terminals and wiring. ATTEMPT to recreate the hard fault by flexing the wire harness and cycling the ignition key frequently. REPAIR any intermittent concerns found. CLEAR the DTCs. REPEAT the self test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316 or passenger seat side air bag module C314. CONNECT driver seat side air bag module C316 or passenger seat side air bag module C314. REPOWER the supplemental restraint system (SRS). REFER to AIR BAG RESTRAINT SYSTEMS .
    2. No  : GO to U3.
  3. U3 VERIFY THE CLIMATE CONTROLLED SEAT BLOWER FAN OPERATION 
    NOTE: After the active command FULL BLOW is commanded to the ON state, the climate controlled seat blower fan will operate for 15 seconds then turn off.
    NOTE: The CCSM is not the source of the fault if the active command mode is operational.
    • Command the FULL BLOW active command ON then OFF and note the climate controlled seat blower fan operation.
    • Does the climate controlled seat blower fan operate? 
    1. Yes  : GO to U4.
    2. No  : GO to  U8.
  4. U4 CHECK CIRCUIT 10-FA18 (GY/BK) AND CIRCUIT 20S-FA18 (PK/OG) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: Driver CCSM C3031b or Passenger CCSM C3036b.
    • Disconnect: Driver Climate Controlled Seat Blower Fan C3033 or Passenger Climate Controlled Seat Blower Fan C3038.
    • Key in ON position.
    • Measure the voltage between driver CCSM C3031b-10 (or passenger CCSM C3036b-10), circuit 20S-FA18 (PK/OG), harness side and ground; and between driver CCSM C3031b-14 (or passenger CCSM C3036b-14), circuit 10-FA18 (GY/BK), harness side and ground.
      Fig 2: Measuring Voltage Between Driver CCSM C3031B-10, Circuit 20S-FA18 (PK/OG), Harness Side And Ground
      G03203805Courtesy of FORD MOTOR CO.
    • Are the voltages less than 0.2 volt? 
    1. Yes  : GO to U5.
    2. No  : REPAIR the affected circuits. CLEAR the DTCs. REPEAT the self test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316 or passenger seat side air bag module C314. CONNECT driver seat side air bag module C316 or passenger seat side air bag module C314. REPOWER the supplemental restraint system (SRS). REFER to AIR BAG RESTRAINT SYSTEMS .
  5. U5 CHECK CIRCUIT 10-FA18 (GY/BK) AND CIRCUIT 20S-FA18 (PK/OG) FOR SHORT TO GROUND 
    • Key in OFF position.
    • Measure the resistance between driver CCSM C3031b-10 (or passenger CCSM C3036b-10), circuit 20S-FA18 (PK/OG), harness side and ground; and between driver CCSM C3031b-14 (or passenger CCSM C3036b-14), circuit 10-FA18 (GY/BK), harness side and ground.
      Fig 3: Measuring Resistance Between Driver CCSM C3031B-10, Circuit 20S-FA18 (PK/OG), Harness Side And Ground
      G03203806Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    1. Yes  : GO to U6.
    2. No  : REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316 or passenger seat side air bag module C314. CONNECT driver seat side air bag module C316 or passenger seat side air bag module C314. REPOWER the supplemental restraint system (SRS). REFER to AIR BAG RESTRAINT SYSTEMS .
  6. U6 CHECK CIRCUIT 10-FA18 (GY/BK) AND CIRCUIT 20S-FA18 (PK/OG) FOR AN OPEN 
    • Measure the resistance between driver CCSM C3031b-10 (or passenger CCSM C3036b-10), circuit 20S-FA18 (PK/OG), harness side and driver climate controlled seat blower fan C3033-1 (or passenger climate controlled seat blower fan C3038-1), circuit 20S-FA18 (PK/OG), harness side; and between driver CCSM C3031b-14 (or passenger CCSM C3036b-14), circuit 10-FA18 (GY/BK), harness side and driver climate controlled seat blower fan C3033-2 (or passenger climate controlled seat blower fan C3038-2), circuit 10-FA18 (GY/BK), harness side.
      Fig 4: Measuring Resistance Between Driver CCSM C3031B-10, Circuit 20S-FA18 (PK/OG), Harness Side
      G03203807Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    1. Yes  : GO to U7.
    2. No  : REPAIR the affected circuit. CLEAR the DTCs. REPEAT the self test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316 or passenger seat side air bag module C314. CONNECT driver seat side air bag module C316 or passenger seat side air bag module C314. REPOWER the supplemental restraint system (SRS). REFER to AIR BAG RESTRAINT SYSTEMS .
  7. U7 CHECK THE CLIMATE CONTROLLED SEAT BLOWER FAN OUTPUT 
    • Connect: Driver Climate Controlled Seat Blower Fan C3033 or Passenger Climate Controlled Seat Blower Fan C3038.
    • Connect fused (5A) jumper leads between driver CCSM C3031a (or passenger CCSM C3036a) as follows:
      • Driver CCSM C3031 b-10 (or passenger CCSM C3036b-10), circuit 20S-FA18 (PK/OG), harness side and battery positive.
      • Driver CCSM C3031b-13 (or passenger CCSM C3036b-13), circuit 8-FA18 (WH/BK), harness side and battery positive.
      • Driver CCSM C3031b-3 (or passenger CCSM C3036b-3), circuit 31S -FA18 (BK/RD), harness side and ground.
        Fig 5: Checking Climate Controlled Seat Blower Fan Output
        G03203808Courtesy of FORD MOTOR CO.
    • Measure the voltage between driver CCSM C3031b-14 (or passenger CCSM C3036b-14), circuit 10-FA18 (GY/BK), harness side and ground.
      Fig 6: Measuring Voltage Between Driver CCSM C3031B-14, Circuit 10-FA18 (GY/BK), Harness Side And Ground
      G03203809Courtesy of FORD MOTOR CO.
    • Is voltage present? 
    1. Yes  : INSTALL a new CCSM. CONFIGURE the CCSM. REFER to MODULE COMMUNICATIONS NETWORK - LS . CLEAR the DTCs. REPEAT the self test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316 or passenger seat side air bag module C314. CONNECT driver seat side air bag module C316 or passenger seat side air bag module C314. REPOWER the supplemental restraint system (SRS). REFER to AIR BAG RESTRAINT SYSTEMS .
    2. No  : INSTALL a new climate controlled seat blower fan. CLEAR the DTCs. REPEAT the self test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316 or passenger seat side air bag module C314. CONNECT driver seat side air bag module C316 or passenger seat side air bag module C314. REPOWER the supplemental restraint system (SRS). REFER to AIR BAG RESTRAINT SYSTEMS .
  8. U8 CHECK CIRCUIT 31S-FA18 (BK/RD) AND CIRCUIT 8-FA18 (WH/BK) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: Driver CCSM C3031b or Passenger CCSM C3036b.
    • Disconnect: Driver Climate Controlled Seat Blower Fan C3033 or Passenger Climate Controlled Seat Blower Fan C3038.
    • Key in ON position.
    • Measure the voltage between driver CCSM C3031b-3 (or passenger CCSM C3036b-3), circuit 31S -FA18 (BK/RD), harness side and ground; and between driver CCSM C3031b-13 (or passenger CCSM C3036b-13), circuit 8-FA18 (WH/BK), harness side and ground.
      Fig 7: Measuring Voltage Between Driver CCSM C3031B-3, Circuit 31S -FA18 (BK/RD), Harness Side And Ground
      G03203810Courtesy of FORD MOTOR CO.
    • Are the voltages less than 0.2 volt? 
    1. Yes  : GO to U9.
    2. No  : REPAIR the affected circuits. CLEAR the DTCs. REPEAT the self test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316 or passenger seat side air bag module C314. CONNECT driver seat side air bag module C316 or passenger seat side air bag module C314. REPOWER the supplemental restraint system (SRS). REFER to AIR BAG RESTRAINT SYSTEMS .
  9. U9 CHECK CIRCUIT 31S-FA18 (BK/RD) AND CIRCUIT 8-FA18 (WH/BK) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Measure the resistance between driver CCSM C3031b-3 (or passenger CCSM C3036b-3), circuit 31S -FA18 (BK/RD), harness side and ground; and between driver CCSM C3031b-13 (or passenger CCSM C3036b-13), circuit 8-FA18 (WH/BK), harness side and ground.
      Fig 8: Measuring Resistance Between Driver CCSM C3031B-3, Circuit 31S -FA18 (BK/RD), Harness Side And Ground
      G03203811Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    1. Yes  : GO to U10.
    2. No  : REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316 or passenger seat side air bag module C314. CONNECT driver seat side air bag module C316 or passenger seat side air bag module C314. REPOWER the supplemental restraint system (SRS). REFER to AIR BAG RESTRAINT SYSTEMS .
  10. U10 CHECK CIRCUIT 31S-FA18 (BK/RD) AND CIRCUIT 8-FA18 (WH/BK) FOR AN OPEN 
    • Measure the resistance between driver CCSM C3031b-3 (or passenger CCSM C3036b-3), circuit 31S -FA18 (BK/RD), harness side and driver climate controlled seat blower fan C3033-4 (or passenger climate controlled seat blower fan C3038-4), circuit 31S-FA18 (RD/BK), harness side; and between driver CCSM C3031b-13 (or passenger CCSM C3036b-13), circuit 8-FA18 (WH/BK), harness side and driver climate controlled seat blower fan C3033-3 (or passenger climate controlled seat blower fan C3038-3), circuit 8 -FA18 (WH/BK), harness side.
      Fig 9: Measuring Resistance Between Driver CCSM C3031B-3, Circuit 31S -FA18 (BK/RD), Harness Side
      G03203812Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    1. Yes  : GO to U11.
    2. No  : REPAIR the affected circuit. CLEAR the DTCs. REPEAT the self test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316 or passenger seat side air bag module C314. CONNECT driver seat side air bag module C316 or passenger seat side air bag module C314. REPOWER the supplemental restraint system (SRS). REFER to AIR BAG RESTRAINT SYSTEMS .
  11. U11 CHECK THE CLIMATE CONTROLLED BLOWER FAN OPERATION 
    • Connect: Driver Climate Controlled Seat Blower Fan C3033 or Passenger Climate Controlled Seat Blower Fan C3038.
    • Connect fused (5A) jumper leads between driver CCSM C3031b (or passenger CCSM C3036b) as follows:
      • Driver CCSM C3031b-10 (or passenger CCSM C3036b-10), circuit 20S-FA18 (PK/OG), harness side and battery positive.
      • Driver CCSM C3031b-13 (or passenger CCSM C3036b-13), circuit 8-FA18 (WH/BK), harness side and battery positive.
      • Driver CCSM C3031b-3 (or passenger CCSM C3036b-3), circuit 31S -FA18 (BK/RD), harness side and ground.
        Fig 10: Checking Climate Controlled Blower Fan Operation
        G03203813Courtesy of FORD MOTOR CO.
    • Does the climate controlled seat blower fan operate? 
    1. Yes  : INSTALL a new CCSM. CONFIGURE the CCSM. REFER to MODULE COMMUNICATIONS NETWORK - LS CLEAR the DTCs. REPEAT the self test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316 or passenger seat side air bag module C314. CONNECT driver seat side air bag module C316 or passenger seat side air bag module C314. REPOWER the supplemental restraint system (SRS). REFER to AIR BAG RESTRAINT SYSTEMS .
    2. No  : INSTALL a new climate controlled seat blower fan. CLEAR the DTCs. REPEAT the self test. TEST the system for normal operation. TURN the ignition OFF. DISCONNECT the battery ground cable. DISCONNECT the restraint system diagnostic tool from driver seat side air bag module C316 or passenger seat side air bag module C314. CONNECT driver seat side air bag module C316 or passenger seat side air bag module C314. REPOWER the supplemental restraint system (SRS). REFER to AIR BAG RESTRAINT SYSTEMS .
scientia non olet · About LEMON Manuals