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GMC YukonModel years 2000–2006

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Audio and telematicsModel years 2000–2000Manufacturer

No response when the OnStar button is pressed (DTC B2476): button assembly test values

The article covers 1998-2000 OnStar equipped vehicles and lists the 2000 GMC Yukon and Yukon XL (2WD and 4WD).

FaultCrate・No response when the OnStar button is pressed (DTC B2476): button assembly test values

On 1998-2000 OnStar equipped vehicles there may be no response when the OnStar button is pressed.

The OnStar VS-3B buttons may not operate and the telltale LED may not flash after the OnStar Center button or Emergency button is pressed; a DTC B2476 may also be present.

How to tell

What to do

  1. With the ignition in the On position, check for 7-10 volts between pin E6 and E1; if there is no voltage and the wire at the terminal is not shorted to ground, replace the VIU.
  2. Back probe the blue VIU connector between terminals E4 and E1: there should be no voltage with the system on and no buttons pressed.
  3. Press and hold the Call Answer/End button: the voltage should be 0.33 volts +/- 10%.
  4. Press and hold the OnStar Services button: the voltage should be 1.3 volts +/- 10%.
  5. Press and hold the Emergency button: the voltage should be 2.2 volts +/- 10%.
  6. If the readings do not agree with the specified values, replace the button assembly; if it is a mirror mounted button assembly, replace the mirror.

What is needed

Parts and materials
  • VIU (if there is no voltage between pin E6 and E1 and the wire at the terminal is not shorted to ground)
  • Button assembly (if the readings do not agree with the specified values; the mirror, for a mirror mounted button assembly)
Labor time
Not stated
Special tools
Not stated
Scan tool
Not stated

Only what the technical documents state. "Not stated" does not mean not needed.

Caution

  • In these cases use OnStar Diagnostic Table DT3 (OnStar Button Assembly Test), but the values given in step 7 of that test are incorrect.

Applies to

  • The affected models include the 2000 GMC Yukon 2WD & 4WD and Yukon XL 2WD & 4WD.
See the evidence (1 documents, 10 passages)
DocumentPublisherDate
[1]GM TechLink, September 2000 ↗
ManufacturerGeneral Motors
2000-09-01

  • Applies toThe affected models include the 2000 GMC Yukon 2WD & 4WD and Yukon XL 2WD & 4WD.

    2000 GMC Yukon 2WD & 4WD and Yukon XL 2WD & 4WD— [1]

  • First signsOn 1998-2000 OnStar equipped vehicles there may be no response when the OnStar button is pressed.

    T h e re may not be a response when the OnStar button is p ressed on 1998-2000 OnStar equipped vehicles.— [1]

  • First signsThe OnStar VS-3B buttons may not operate and the telltale LED may not flash after the OnStar Center button or Emergency button is pressed; a DTC B2476 may also be present.

    In addition, the OnStar VS-3B buttons may not operate and the telltale LED may not flash after the OnStar Center button or E m e rgency button is pressed. A DTC B2476 also may be pre- sent in the system.— [1]

  • How to confirmWith the ignition in the On position, check for 7-10 volts between pin E6 and E1; if there is no voltage and the wire at the terminal is not shorted to ground, replace the VIU.

    1. Ignition in On position. 2. Check to ensure Voltage of 7- 10 Volts between Pin E6 and E1. If there is no voltage here and the wire at terminal E^ is not shorted to ground, Replace the VIU.— [1]

  • How to confirmBack probe the blue VIU connector between terminals E4 and E1: there should be no voltage with the system on and no buttons pressed.

    3. Back probe the blue VIU connector for Vo l t a g e between terminals E4 and E1. There should be no voltage when the system is On and no buttons are depre s s e d .— [1]

  • How to confirmPress and hold the Call Answer/End button: the voltage should be 0.33 volts +/- 10%.

    4. Press and hold the Call Answer/End button. The Voltage should be 0.33 volts +/- 10%.— [1]

  • How to confirmPress and hold the OnStar Services button: the voltage should be 1.3 volts +/- 10%.

    5. Press and hold the OnStar Services button. The voltage should be 1.3 Volts +/- 10%.— [1]

  • How to confirmPress and hold the Emergency button: the voltage should be 2.2 volts +/- 10%.

    7. Press and hold the Emergency button. The voltage should be 2.2 Volts +/- 10%— [1]

  • RepairIf the readings do not agree with the specified values, replace the button assembly; if it is a mirror mounted button assembly, replace the mirror.

    If the readings do not agree with the specified values, the button assembly must be replaced. If this is a mirror mounted button assembly, the mirror must be re p l a c e d .— [1]

  • CautionIn these cases use OnStar Diagnostic Table DT3 (OnStar Button Assembly Test), but the values given in step 7 of that test are incorrect.

    If any of these conditions are pre s e n t , refer to the OnStar Diagnostic Table DT3 (OnStar Button Assembly Test). However, the values given in step 7 of the test are incorre c t .— [1]

Put together by FaultCrate from public records and technical documents. The cause and the repair are for the workshop to decide with the vehicle in front of it. Counts are records, not failure rates.

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