GM TechLink 2000-09-01

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Original text

OnStar Button Test 2000 GMC Yukon 2WD & 4WD and Yukon XL 2WD & 4WD T h e re may not be a response when the OnStar button is p ressed on 1998-2000 OnStar equipped vehicles. 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. 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 . 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. 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 . 4. Press and hold the Call Answer/End button. The Voltage should be 0.33 volts +/- 10%. 5. Press and hold the OnStar Services button. The voltage should be 1.3 Volts +/- 10%. 7. Press and hold the Emergency button. The voltage should be 2.2 Volts +/- 10% 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 .

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Source

Source: GM TechLink — Communication from a manufacturer to dealers (summary published by a government agency)
Reporter type: Manufacturer
Source reference: 2000-09-01
Country / market: US
Language: en
Document version: Version 3 (3 held)
Note on the source: Copyright General Motors Corporation. No licence is stated. Held as the headline and short quoted passages with the issue named and linked; the articles themselves are not stored or shown.

Dates

Incident date: Unknown
Received by source: 2000-09-01
Added to the source's file: Unknown: not returned by the source API
Issued / published: 2000-09-01
First observed: 2026-10-06 09:01 UTC (initial bulk load)
This version fetched: 2026-10-09 12:52 UTC