Before replacing parts there is a specific way to start diagnostics an a professional grade scan tool is a must ! a code reader can not access the body control module , or the EBCM - electronic brake control module or instrument cluster ! All these modules communicate on the class 2 serial data bus.
The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.
Begin the system diagnosis with Diagnostic System Check - ABS . The Diagnostic System Check will provide the following information:
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The identification of the control modules which command the system
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The ability of the control modules to communicate through the serial data circuit
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The identification of any stored diagnostic trouble codes (DTCs) and their status
The traction control switch is a input to the body control module, with a scan tool hooked up an looking at BCM data ,check for conformation the traction control switch is turning on an off !
SERVICE TRACTION SYSTEM
The IPC illuminates the SERVICE TRACTION SYSTEM indicator in the message center when the electronic brake control module (EBCM) detects a malfunction in the traction control system. The IPC receives a class 2 message from the EBCM requesting illumination. The SERVICE TRACTION SYSTEM indicator illuminates for 60 seconds when the condition is present. The IPC sends a class 2 message to the radio in order to activate an audible warning.
TRAC OFF
The IPC illuminates the TRAC OFF indicator when the following occurs:
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The electronic brake control module (EBCM) inhibits the traction control system due to a malfunction in the traction control system. The IPC receives a class 2 message from the EBCM requesting illumination.
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The body control module (BCM) detects that the traction control switch has been pressed (signal circuit is low). The BCM sends a class 2 message to the EBCM in order to disable traction control. The IPC receives a class 2 message from the EBCM requesting illumination. The BCM sends a class 2 message to the radio in order to activate an audible warning.
I replaced the sensors..and found the sensor wires was broken ,, (the coppers wires are broken but the outside insulator is still intact - I pulled on the wire to find broken places) Re-spiced the wires .. It works.
SOURCE: 2005 impala ls the abs light and the traction control light comes
You'll need to have the codes read from the computer. You will have a code that indicates one of the front wheel sensors is bad. This could be the case, but they are very expensive as they are built into the wheel bearing assemblies. It is more likely that the wiring harness between the frame and the part of the front spindle that holds the harness, has broken internally. It is a very common problem and can be repaired with a new wiring harness section or by tracking down the fault and repairing it.
SOURCE: abs and traction control
hi if you know for sure it's a wheel speed sensor
remove that wheel
remove the caliper and caliper bracket
remove the brake rotor
there are 3 bolts on the other side of the knuckle(13mm)
remove them
remove the axle nut(1 5/16)
remove the hub bearing assembly(you may need to use a hammer on the hub flange)
hope this helps
SOURCE: 2005 Impala abs & traction control problem
2005 Impala it turn off some times when I am coming to a complete stop or when I am slowing down but it starts right back up with no problem can you help me
SOURCE: 03 Yukon Denali Traction Control/ ABS Problems
my 2000 yukon has the traction control light on and the abs light on any anwsers?
SOURCE: Replaced ignition switch 2003 chevy impala and car will not start
After you replace the ignition switch turn the key to start the car and release leave the key were it stops after trying to start wait 10 minutes until security light goes out turn key to full off position then repeat the above procedure two more times for a total of three on the 3rd attempt to start car wait for light to go out then turn key to full off positoion wait 10 seconds then try to start car body control module should learn new pass code and the car should start.
Big john, J@J Automotive
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did you reset the computer when you put the new switch on it?? - I was told the best way to do this is unhook the ground side of the battery (then the hot side) while the new part is being replaced then hook the hot side back up first then the ground side!!
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