Auto Repair Manual Free Download and ReviewsFree download ebook pdf files automotive manual

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Power Door Locks Inoperative Diagnostic Instructions • Perform the Diagnostic System Check – Vehicle prior to using this diagnostic procedure. • Review Strategy Based Diagnosis for an overview of the diagnostic approach. • Diagnostic Procedure Instructions provides an overview of each diagnostic category. Diagnostic Fault Information Circuit Switch Side Supply Voltage Relay Door Lock/Unlock Signal Door Latch Control Driver Door Lock Switch Ground Passenger Front Door Lock Switch Ground BCM Ground 1. Door Lock Malfunction 2. Door Lock Switch Malfunction Circuit/System Description The DR LCK fuse supplies battery positive voltage to the body control module BCM for the door lock system. The BCM supplies and monitors a reference voltage to the door lock switch through the door lock switch lock/unlock signal circuit. The door lock switch also receives a constant ground source. If a door lock switch is placed in the lock position, the reference voltage is taken directly to ground and the BCM senses 0.0 volts on the signal circuit. If a door lock switch is placed in the unlock position, the reference voltage is taken to ground through a 1.5k ohm resistor that is internal to the door lock switches and senses approximately 2.9 volts on the signal circuit. This is how the BCM determines what portion of the door lock switch was activated. The BCM, upon receipt of a door lock switch lock or unlock signal, will switch the appropriate door lock actuator control circuits to battery positive voltage. The opposing side of the door lock actuators are connected to ground internally within the BCM through the other door lock actuator control circuit and the doors will lock or unlock appropriately. Vehicles without keyless entry have two internal drivers in the BCM to control the door lock actuators. All door lock and all door unlock. Vehicles equipped with keyless entry have three internal drivers in the BCM. Driver door unlock, passenger door unlock and all door lock. This is done to isolate the driver door lock actuator so it can be unlocked by itself using the keyless entry transmitter.

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DESCRIPTION On vehicles equipped with the Vehicle Theft Security System (VTSS), doors (liftgate), hood and ignition circuit are monitored by the Body Control Module (BCM) when system is armed. VTSS will prevent engine from starting until BCM receives disarm signal. If VTSS is triggered, horn will pulse, headlights and marker lights will flash and VTSS warning light will flash. OPERATION ARMING PROCEDURE METHOD “A” Remove key from ignition, open any door and actuate one of the following: Power door lock button to LOCK. Key fob LOCK button. Door lock key cylinder to locked position. Close all doors. After last door is closed, arming time-out period of 16 seconds begins, after which VTSS becomes armed. ARMING PROCEDURE METHOD “B” Actuating key fob LOCK button, or key locking front doors or liftgate with doors closed and ignition locked will begin arming time-out period. TIME-OUT PERIOD VTSS system requires 16 seconds to time-out and arm. TRIGGERING VTSS SYSTEM After VTSS is armed, the following actions will trigger alarm: Opening any door. Opening hood. Turning ignition switch to ON or UNLOCK position. TESTING See BODY CONTROL COMPUTER TESTS in the BODY CONTROL COMPUTER article.

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Tests/Procedures: Potential Causes: Tech Tips: 1. Unplug the Vehicle Speed Sensor (VSS) in the rear differential. 2. Check the voltage on the Pink/Orange wire in the VSS connector. The Body Control Module (BCM) sends B+ out to the sensor on the Pink/Orange wire at pin 21 in the C2 connector of the Body Control Module (BCM) . 3. Check the resistance of the Dark Green/Orange wire to ground. It should be 100- 300 ohms. The BCM has a resistor to ground to lower the current flow in the circuit. 4. If both wires are OK, replace the VSS. Body Control Module (BCM) Vehicle Speed Sensor (VSS) Wiring Vehicles with ABS get the VSS signal from the same sensor but the signal first goes to the Controller Anti-lock Brakes (CAB) and then to the Body Control Module (BCM) and then to the Powertrain Control Module (PCM). Confirmed Fix 2 2 2 1 – - – - Vehicle Speed Sensor (VSS) Connector Vehicle Speed Sensor (VSS) Wiring Wiring Rear Wheel Speed Sensor

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Ignition Off Draw (100) Front Wipers Anti-Lock Brake System (ABS) Module Power Outlet (Selectable) Radio, Amplifier, Navigation, Hands-Free Phone (HFM), Electronic Vehicle Information Center (EVIC), EC, SNRF, Mirror Power Outlet Horn Ignition Switch 1 40 Amp/Green Anti-Lock Brake System (ABS) Pump 2 Spare 3 30 Amp/Pink 4 40 Amp/Green Body Control Module (BCM) Feed 1 5 40 Amp/Green Electronic Back Light (EBL) 6 30 Amp/Pink 7 40 Amp/Green Starter 8 40 Amp/Green Power Seat C/B 9 40 Amp/Green Power Sunroof 10 Spare 11 40 Amp/Green Headlight Washer, Power Liftgate 12 Spare 13 40 Amp/Green Radiator Fan 1 14 Spare 15 40 Amp/Green 24 20 Amp/Yellow 25 15 Amp/Blue 26 20 Amp/Yellow 27 Spare 28 25 Amp/Clear 29 20 Amp/Yellow Cluster, CHMSL, Stop low Lights, Anti-Lock Brake System (ABS) 30 10 Amp/Red 31 20 Amp/Yellow Hazard 36 20 Amp/Yellow 37 25 Amp/Clear 38 20 Amp/Yellow 39 20 Amp/Yellow 40 40 Amp/Green 41 40 Amp/Green 42 40 Amp/Green 44 25 Amp/Clear 45 10 Amp/Red 46 20 Amp/Yellow 47 20 Amp/Yellow 48 15 Amp/Blue 50 15 Amp/Blue Elctronic Automatic Transaxie (FATX) Solenoid ASD Fuel Pump A/C Clutch, MTV Driver Door Node Passenger Door Node Front Blower Rear Heated Seats Anti-Lock Brake System (ABS) Jgnition Run Passenger Door Driver Door PLG, OHC, Body Control Module (BCM), Navigation, Hands-Free Phone (HFM) HVAC, DVD, RAD, CLK, SKRFFM