LEMON Manuals: Even more car manuals for everyone
Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 155 (Seat System - Seating) >> Diagnostic Tests >> Seats >> Pinpoint Tests >> Pinpoint Test P: The Heated Seat is Inoperative - Passenger, Does Not Operate in Low >> Pinpoint Test P: The Heated Seat Is Inoperative - Passenger, Does Not Operate In Low

Pinpoint Test P: The Heated Seat Is Inoperative - Passenger, Does Not Operate In Low

WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
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.
CAUTION: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
CAUTION: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.
NOTE: The air bag warning indicator illuminates when the correct restraints control module (RCM) fuse is removed and the ignition switch is ON.
NOTE: The supplemental restraint system (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.
  1. P1 CHECK THE HEATED SEAT SWITCH INPUT TO THE HEATED SEAT MODULE 
    • Key in OFF position.
    • Depower the SRS. Refer to Supplemental Restraint System (SRS) Depowering and Repowering in the General Procedures portion of SUPPLEMENTAL RESTRAINT SYSTEM article.
    • For vehicles equipped with seat side air bags, carry out the following:
      • Disconnect the passenger seat side air bag C316.
      • Connect the Restraint System Diagnostic Tool to the passenger seat side air bag C316.
    • Disconnect: Passenger Heated Seat Module C329
      • WARNING: Make sure no one is in the vehicle and there is nothing blocking or placed in front of any air bag module when the battery is connected. Failure to follow these instructions may result in serious personal injury in the event of an accidental deployment.
    • Connect the battery ground cable. Refer to BATTERY, MOUNTING & CABLES article.
      • Fig 1: Measuring Resistance
      GF0013097Courtesy of FORD MOTOR CO.
    • Measure the resistance between passenger heated seat module C329-11, circuit 1256 (WH/YE), harness side and ground while pressing the heated seat switch.
    • Is the resistance less than 50 ohms when the heated seat switch is pressed and greater than 10,000 ohms when the heated seat switch is not pressed? 
    1. YES  : INSTALL a new heated seat module. REFER to Heated Seat Module . TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the Restraint System Diagnostic Tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.
    2. NO  : Go to  P2.
  2. P2 CHECK CIRCUITS 1256 (WH/YE) AND 1255 (WH/RD) FOR AN OPEN OR SHORT TO GROUND 
    • Disconnect: Passenger Heated Seat Switch C630
      • Fig 2: Measuring Resistance
      GF0013098Courtesy of FORD MOTOR CO.
    • Measure the resistance between passenger heated seat switch C630-2, circuit 1255 (WH/RD), harness side and passenger heated seat module C329-11, circuit 1256 (WH/YE), harness side; and between passenger heated seat switch C630-2, circuit 1255 (WH/RD), harness side and ground.
    • Is the resistance less than 1 ohm between the heated seat switch and the heated seat module and greater than 10,000 ohms between the heated seat switch and ground? 
    1. YES  : Go to  P3.
    2. NO  : REPAIR circuit 1256 (WH/YE) or 1255 (WH/RD). TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the Restraint System Diagnostic Tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.
  3. P3 CHECK CIRCUIT 1256 (WH/YE) FOR A SHORT TO VOLTAGE 
    • Key in ON position.
      • Fig 3: Measuring Voltage
      GF0013099Courtesy of FORD MOTOR CO.
    • Measure the voltage between passenger heated seat module C329-11, circuit 1256 (WH/YE), harness side and ground.
    • Is any voltage present? 
    1. YES  : REPAIR circuit 1256 (WH/YE). TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the Restraint System Diagnostic Tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.
    2. NO  : INSTALL a new heated seat switch. REFER to Heated Seat Switch . TEST the system for normal operation. For vehicles equipped with seat side air bags, DISCONNECT the battery ground cable. DISCONNECT the Restraint System Diagnostic Tool from passenger seat side air bag module C316. CONNECT passenger seat side air bag module C316. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article.
scientia non olet · About LEMON Manuals