Question about 2004 Chevrolet TrailBlazer

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On Board diagnostic system

Where is the Diagnostic link connector, (DLC) located? I have to take in my 2004 Chevy Trailblazer for the Vehicle emissions test and have to remove, (cover) for their techs to run diagnostics.

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  • ducati817 Sep 15, 2008

    Thank you so much!

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Under the dash on the drivers side. when you take it in they will do it for you. that is their job.

Posted on Sep 15, 2008

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Fuses controlling abs on 2005 ford taurus


Inspection and Verification
  1. Verify the customer concern.
  1. Verify the stoplamps operate correctly by pressing and releasing the brake pedal with the ignition switch in the OFF position. If the stoplamps do not operate correctly, refer to Section 417-01 . If the stoplamps operate correctly, proceed to the next step.
  1. Verify that the PRNDL operates correctly on the instrument cluster. If the PRNDL does not operate correctly, refer to Section 413-01 . If the PRNDL operates correctly, proceed to the next step.
  1. Visually inspect for obvious signs of mechanical or electrical damage.


Visual Inspection Chart Mechanical Electrical
  • Wheel speed sensor ring
  • Hydraulic control unit (HCU)
  • Incorrectly inflated tires
  • Mismatched wheels or tires on vehicle
  • Base brake concern
  • Brake booster vacuum hose
  • Specified steering components, suspension components and tire size
  • Battery junction box (BJB) fuse(s):
    • 32 (40A)
    • 35 (20A)
  • Smart junction box (SJB) fuse 27 (10A)
  • Anti-lock brake system (ABS) module
  • Wheel speed sensors
  • Brake pedal position (BPP) switch
  • Brake fluid level switch
  • Wiring harness
  • Connectors or connections
  • Circuitry

  1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
  1. If the concern remains after the inspection, connect the diagnostic tool to the data link connector (DLC) located beneath the instrument panel, and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
    • check that the program card is correctly installed.
    • check the connection of the data link connector to the vehicle.
    • check that the ignition switch is in the RUN position.
  1. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.
  1. NOTE: The battery voltage must be greater than 9.4V for the self-test to operate correctly.
    Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
    • CAN or ISO circuit fault; all electronic control units no response/not equipped, refer to Section 418-00 .
    • No response/not equipped for the ABS module, Go To Pinpoint Test A .
    • System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out the self-test diagnostics for the ABS module.
  1. If the DTCs retrieved are related to the concern, go to the Anti-lock Brake System (ABS) Module Diagnostic Trouble Code (DTC) Index to continue diagnostics.
  1. If no DTCs related to the concern are retrieved, GO to Symptom Chart to continue diagnostics.

Apr 08, 2016 | Ford Cars & Trucks

1 Answer

Diagnostic connector location


USA? what country?
RHD or LHD (right or left hand drive)?????
all usa cars, the 16pin DLC is less than 1meter from the steering wheel.
yours is behind the ash try(pull it)
some old honda's here, usa have dual ways to get scan codes.
the obd2 way , and obd1 way, RTM
read the FSM. or google for that.
I use ,alldata.com for fast answers, saving google searches and bad answers on forums...

fsm quote.
The 16-pin On Board Diagnostic version II (OBD-II) compliant Data Link Connector (DLC) is used to access the Diagnostic Trouble Codes (DTCs) using an OBD-II compliant Data Scan Tool (DST). It is an electrical connector with a gray housing located under the dash, either near the center console, on the passenger side of the vehicle or to the left of the driver side of the vehicle.
The two wire electrical connector with a blue housing next to the DLC is the Service Check Connector (SCS).


we (uSA have 2 DLCs. one is OBD2 and other is SCS.

id use a real scan tool. and not fool with the old winky blinky bs.
the scan tool you can check all live sensor data.
do that. and win.
1st goggle hit on SCS
http://honda-tech.com/showthread.php?t=2703528

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On-Board Diagnostic II (OBD II) Diagnostic Link Connector (DLC) Location in 1999 ford Ranger


the ecc diagnostic plug is what ford used b 4 going to the obd 2 system check with ur local ford dealer for checking codes

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98 oldsmobile 88 royale code 12 and 41 what could be the problem


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GM Bonneville/Eighty Eight/LeSabre 1986-1999
Reading Codes

Print


1987-97 VEHICLES EXCEPT 1997 MODELS WITH 16-PIN DLC

See Figures 1 and 2
Listings of the trouble for the various engine control system covered in this manual are located in this section. Remember that a code only points to the faulty circuit, NOT necessarily to a faulty component. Loose, damaged or corroded connections may contribute to a fault code on a circuit when the sensor or component is operating properly. Be sure that the components are faulty before replacing them, especially the expensive ones.


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Fig. Fig. 1: ALDL/DLC terminal identification for 1987-97 vehicles, except 1997 models with a 16-pin DLC
The Assembly Line Diagnostic Link (ALDL) or Data Link Connector (DLC) may be located under the dashboard, and is sometimes covered with a plastic cover labeled DIAGNOSTIC CONNECTOR.

  1. The diagnostic trouble codes can be read by grounding test terminal B . The terminal is most easily grounded by connecting it to terminal A (internal ECM ground). This is the terminal to the right of terminal B on the top row of the ALDL connector.
  2. Once the terminals have been connected, the ignition switch must be moved to the ON position with the engine not running.
  3. The Service Engine Soon or Check Engine light should be flashing. If it isn't, turn the ignition switch OFF and remove the jumper wire. Turn the ignition ON and confirm that the light is now on. If it is not, replace the bulb and try again. If the bulb still will not light, or if it does not flash with the test terminal grounded, the system should be diagnosed by an experienced driveability technician. If the light is OK, proceed as follows.
  4. The code(s) stored in memory may be read through counting the flashes of the dashboard warning lamp. The dash warning lamp should begin to flash Code 12. The code will display as one flash, a pause and two flashes. Code 12 is not a fault code. It is used as a system acknowledgment or handshake code; its presence indicates that the ECM can communicate as requested. Code 12 is used to begin every diagnostic sequence. Some vehicles also use Code 12 after all diagnostic codes have been sent.
  5. After Code 12 has been transmitted 3 times, the fault codes, if any, will each be transmitted 3 times. The codes are stored and transmitted in numeric order from lowest to highest.

The order of codes in the memory does not indicate the order of occurrence.
  1. If there are no codes stored, but a driveability or emissions problem is evident, the system should be diagnosed by an experienced driveability technician.
  2. If one or more codes are stored, record them. Refer to the applicable Diagnostic Code chart in this section.
  3. Switch the ignition OFF when finished with code retrieval or scan tool readings.

After making repairs, clear the trouble codes and operate the vehicle to see if it will reset, indicating further problems.

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Fig. Fig. 2: Engine diagnostic trouble codes - 1987-93 vehicles, and 1994 vehicles with a 12-pin DLC connector


197 VEHICLES WITH 16-PIN DLC AND ALL 1995-99 MODELS

See Figures 3 through 7


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Fig. Fig. 3: DLC terminal identification for 1994 vehicles with a 16-pin DLC, as well as all 1995-99 models
On 1994-95 3.4L and 3.8L engines, and all 1996 models, an OBD-II compliant scan tool must be used to retrieve the trouble codes. Follow the scan tool manufacturer's instructions on how to connect the scan tool to the vehicle and how to retrieve the codes.


0996b43f8021af69.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 4: Engine diagnostic trouble codes (1 of 4) - 1994 vehicles with a 16-pin DLC and all 1995-99 vehicles


0996b43f8021af6a.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 5: Engine diagnostic trouble codes (2 of 4) - 1994 vehicles with a 16-pin DLC and all 1995-99 vehicles


0996b43f8021af6b.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 6: Engine diagnostic trouble codes (3 of 4) - 1994 vehicles with a 16-pin DLC and all 1995-99 vehicles


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Fig. Fig. 7: Engine diagnostic trouble codes (4 of 4) - 1994 vehicles with a 16-pin DLC and all 1995-99 vehicles

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tdisline_418.jpg
tdisline_419.jpg
tdisline_420.jpg

On the new Volkswagen Passat B5 (after MY 2001) the Data Link Connector (DLC) or diagnostic port is placed on the panel above pedals. See pictures below:

tdisline_421.jpg
tdisline_422.jpg

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  • To perform Enhanced Diagnostic Tests (bi-directional Scan Tool)
96d7723.gif
Data Link Connector Graphic

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With the advent of OBD-II, the Federal Government has mandated the location of the DLC (Data Link Connector) .The Data Link Connector is located in the passenger compartment. It is attached to the instrument panel and accessible from the driver's seat. The DLC is rectangular in design and capable of allowing access to 16 terminals. The connector has keying features that allow easy connection. The test equipment and the DLC have a latching feature to ensure a good mated connection. The Scan tool uses the DLC as a pathway to communicate with the on board computer system. If the DLC is not located under the dash, the vehicle is using OBD-I. This is a slightly different management system in its operation and diagnosis. Look for DLC under the hood near the left front headlight on the Town Car and Mark VII, near the right side firewall on the Continental.

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