Question about 2004 Chevrolet TrailBlazer

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Liftgate issue not allowing me to lock/unlock vehicle with remote. 'Gate ajar' not lit on dash, but courtesy lights remain on unless overidden. Can only manually lock vehicle, but that is an issue because my key doesn't work in driver side key hole. Please help. Thank you!

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If the key doesn't work on the driver's side door, then the vehicle had the driver's side dor replaced, and whomever did the repair, failed to remove the door lock assembly from the old door and swap it out with the "new" door. This only happens when the door is taken from a wrecked vehicle and used as a replacement. You do not get doors from a factory with the lock assembly in place.

Take the vehicle back to where you had it repaired and tell them that it is thier fault that your vbehicle remote locking system fails. They did not set up (adjust) the switches correctly.

Posted on Aug 23, 2009

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Posted on Jan 02, 2017

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1 Answer

2007 escalade 2 front doors wont trigger dome light but rear 2 doors do? Also killing battery on vehicle, I suspect maybe radio stays on due to vehicle not knowing driver left vehicle.


Door ajar switches maybe bad . Take the door panel off ,find a wiring diagram an test the circuit . Or you could check at the BCM ,would still need wiring diagram so you know what wire is what . Do you know how to test electrical circuits using a DVOM - digital volt ohm meter ? Could also take it to a qualified repair shop an have the BCM checked for DTC'S - diagnostic trouble codes .
The BCM, the door switches, and the liftgate module (LGM) (if equipped with power liftgate) communicate through the GMLAN serial data circuit for the lamp illumination commands of the doors, liftgate, and liftglass open/ajar switch signals. The LGM receives a ground signal from the pawl switch, ratchet switch, and liftglass ajar switch that are located within the liftgate latch and liftglass latch. For all vehicles, the left and right rear door latch switches are both on one circuit that is also an input to the BCM.
If the vehicle has a manual liftgate, there is an input circuit from the liftgate latch switch and liftglass latch switch directly to the BCM.
The left and right front door courtesy lamps receive voltage and ground from the driver door switch and the passenger door switch respectively. The remaining courtesy lamps are controlled and receive voltage through the BCM from the CTSY fuse in the instrument panel fuse block.

DTC B2555 01: Passenger Compartment Lamp Control Circuit Short to Battery
DTC B2555 02: Passenger Compartment Lamp Control Circuit Short to Ground

Aug 07, 2017 | Cars & Trucks

1 Answer

Rear hatch keeps opens while driving...


Unless you have electrical diagnostic skills , I suggest you take this to the dealer ! The lift gate can be opened by operating the switch on the instrument panel. Battery voltage is supplied to the liftgate actuator through the body control module (BCM). The BCM will pulse the lift gate actuator when a release input is received through the key fob, or the instrument panel switch.
The body control module (BCM) receives an input from the liftgate ajar assembly. The ajar assembly is normally open when the liftgate is fully closed. When the liftgate is opened, the ajar assembly contacts close providing a path to ground. The driver information center (DIC) illuminates the rear access open message when the gate is open. The instrument panel cluster (IPC) receives a serial data message from the BCM indicating the liftgate ajar status. If this message is displayed and the vehicle speed is greater than 8 km/h (5 mph), a chime will sound.
It could be ajar switch is bad .

Dec 16, 2015 | 2012 Chevrolet Equinox LS 4dr SUV 2.4L...

1 Answer

Can't get dome lights on when door is opener even with override switch off?


The following lamps may be manually turned ON by placing the interior lamp switch in the ON position, or by opening a door while the switch is in the AUTO position.
?€¢
The dome lamp


?€¢
The liftgate lamps


?€¢
Courtesy/map lights

The courtesy lamp supply voltage circuit of the body control module (BCM) supplies battery positive voltage to the dome lamp, the liftgate lamps, and the map lamps. When any door is opened, the door jamb switch contacts close providing a door open input to the BCM. The BCM then provides a ground to the interior lamps with the switch in the AUTO position. The interior lamps receive a ground at G401 with the switch in the ON position.
Important: If the liftgate is opened after all the modules go to sleep, the dome light will not come on. The liftgate ajar switch input to the BCM will not wake up the BCM once it has gone to sleep, so the dome light will not come on. Once the BCM gets an input to wake it up, from remote keyless entry (RKE) or a door handle, the dome light will turn on when the liftgate is opened.
If the driver inadvertently leaves any interior lamp ON, the BCM will turn it OFF after a 20 minute time-out.
The courtesy lamps will turn OFF immediately if the ignition switch is turned to the ON position or approximately 20 seconds after all doors are closed.
The courtesy lamps are controlled by the body control module (BCM). Inputs from the dome lamp switch and the door ajar switches are monitored by the BCM. When a door ajar switch is closed, or the dome lamp switch is turned to the ON position, the BCM supplies the B+ for the courtesy lamps.
With out a factory Tech2 scan tool or equivalent an knowing how these systems work ,you best bet is to take your vehicle to the dealer or some other ASE certified repair shop !

Sep 04, 2015 | 2009 Buick Enclave

1 Answer

Where is the manual liftgate sensor located 2009 Equinox


The liftgate can be opened by operating the switch on the instrument panel. Battery voltage is supplied to the liftgate actuator through the body control module (BCM). The BCM will pulse the liftgate actuator when a release input is received through the key fob, or the instrument panel switch.
Not sure what your talking about . There is no sensor. there is a relay in the I/P fuse box LIFTGATE PCB relay . an a lift gate actuator motor inside the door . An there is a door ajar switch ,which is part of the latch mechanism. Do you have light lit on the instrument cluster - a picture of a little car with a door open , an maybe a chime sounding ?

Not

Aug 01, 2015 | 2009 Chevrolet Equinox

2 Answers

Why liftgate acuator clicking when lift gate is open


I would bet on the liftgate module (LGM) It controls all that stuff back there,wiper,defrost,gate ajar light,gate lock and unlock ect. Might try wiggleing the wiring boot where the wires go from the body to the gate,if it changes anything,bet on a broken wire inside that boot.
If not the LGM is my first thought.

Feb 15, 2015 | 2004 GMC Envoy

1 Answer

2008 explorer door locks not locking from door switches


This is not a good thing. Ford uses a computer called the GEM and that means General Electronics Module. It controls:
  • Low Coolant Indicator On Cluster
  • Brake Indicator on Cluster
  • DRL - Control
  • Wipers
  • AutoLamps
  • Rear Defrost
  • Interior Lamps(dome)
  • High Beam Indicator only (cluster)
  • Low Coolant indicator
  • Key-in Buzzer
  • Seatbelt indicator only (Cluster)
  • Trunk Pop Relay
  • Power Locks
  • Door Ajar Sensors
  • Door Keyless entry pad
  • Remote Keyless Entry
  • One Touch Down (power window)
  • Air Bag Tone
  • Anti Theft (perimeter Alarm) (SEL, or SE(s) with mods)
  • Lift gate ajar (wagon)
  • Liftgate Pop
  • Accessory Delay signal (accessory that work after engine off, prior to door ajar)
  • Battery Saver Relay signal (accessory that work after engine off, 15 mins) Map lights, vanity mirrors

They are located behind the radio in the dash and they are $$$ about 600 USD.

Jan 27, 2014 | 2008 Ford Explorer

2 Answers

Rear tail gate will not open


how to i open a stuck lift garte on a ford winstar 2000 lock broken too

Jun 14, 2009 | 2001 Ford Escape

1 Answer

2006 Tahoe Z71 Lift Gate Will Not Unlock With Remote


Take the liftgate inside panel off an check the wiring , connections etc....
rear door hatch lock repair GMC Chevrolet
chevy tahoe lift gate not opening
The liftgate will lock any time the vehicle is shifted out of park on vehicles equipped with an automatic transmission and at vehicle speeds exceeding 5 kph with manual transmission. This happens in conjunction with auto door locks if enabled or independently of auto door locks if the feature is disabled. This ensures that the liftgate is locked anytime the vehicle is shifted out of park or when the vehicle is in motion.
The liftgate lock relay supply and coil sides receive a constant voltage through the battery voltage supply circuit and the ECC fuse. The normally closed contact is connected to ground and the control side is connected to the body control module (BCM). A lock function will occur when a door lock switch activation, keyless entry lock transmission, auto door lock function or a liftgate lock function has been received by the BCM. The BCM will then ground the control side of the liftgate lock relay. This energizes the relay and allows voltage to be applied to the liftgate lock actuator lock control circuit. Since the other side of the liftgate lock actuator is connected to the normally closed contacts of the door unlock relay to ground, the liftgate will lock. When an unlock function occurs the BCM will ground the control side of the unlock relay and the rear doors and liftgate will unlock.
The BCM also runs diagnostics on the liftgate lock relay control circuit and will set DTC B3825 as current and also send a Class 2 message to the DIC. The DIC will display REPLACE LIFTGATE FUSE to inform the driver that a fault has been detected in the liftgate lock circuit and that the liftgate is not locked. Faults that will set the DTC and cause the DIC to display the message could be any of the following

Power Door Locks Inoperative - Endgate/Liftgate

Schematic Reference: Door Lock/Indicator Schematics
Connector End View Reference: Power Door Systems Connector End Views
1
Did you perform the Diagnostic System Check - Vehicle?
YES - Go to Step 2
NO - Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2
Activate the door lock switches to the lock and unlock positions.
Do both rear passenger doors lock and unlock?
YES - Go to Step 3
NO - Go to Power Door Locks Inoperative
3
Did the liftgate lock actuator lock and unlock?
YES - Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
NO - Go to Step 4
4
Disconnect liftgate door lock actuator.
With a test lamp connected to a good ground, probe the door lock actuator lock circuit at the door lock actuator harness connector.
Activate a door lock switch to lock position.
Does the test lamp illuminate?
YES - Go to Step 5
NO - Go to Step 7
5
With a test lamp connected to a good ground, probe the door lock actuator unlock circuit at the door lock actuator harness connector.
Activate a door lock switch to unlock position.
Does the test lamp illuminate?
YES - Go to Step 6
NO - Go to Step 8
6
Inspect for poor connections at the harness connector of the door lock actuator. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
YES - Go to Step 10
NO .. Go to Step 9
7
Repair the open door lock actuator lock circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
YES - Go to Step 10
--
8
Repair the open in the door lock actuator unlock circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 10
--
9
Replace the liftgate door lock actuator. Refer to Door Lock Actuator Replacement in Body Rear End.
Did you complete the repair?
Go to Step 10
--
10
Operate the system in order to verify the repair.
Did you correct the condition?
System OK
Go to Step 2

Apr 27, 2017 | 2006 Chevrolet Tahoe

2 Answers

DONT KNOW HOW TO FIX A FEW PROBLEMS


When my "door ajar" light was on it was because the liftgate sensors (switches) indicated that the gate was open, even thought it wasn't. I took off the plastic trim, and took out the sensors - but that isn't necessary. Just soak with the switches with silicone spray, and see if that helps. There is one on each side of the liftgate - I believe both must indicate "closed" for the light to go off.

I have gotten replacement motors at Checkers for both driver and passenger doors - so now I have lifetime replacement motors.. The first time you replace them, a little drilling is needed on the door sheet metal, but it will not show up once the trim is reinstalled. This repair is a little involved, but well within the capability of a novice mechanic.

May 21, 2009 | 1998 Ford Windstar

1 Answer

LIFTGATE AJAR LIGHTS UP


the problem is the lift-gate ajar/courtesy light switch that is located on the left and right latch assemble of the lift gate, they stick and cause this concern, there are numerous technical service bulletins from Ford about this, have replaced at least 100. PS, washing the engine had nothing to do with it, u can try using spray lube on the latch's and open and close the gate repeatably to see if the switch un-sticks.

Dec 14, 2008 | 2003 Lincoln Navigator

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