GM Service Manual Online
For 1990-2009 cars only
Makes
🢒
GMC_Truck
🢒
2009
🢒
Sierra - 4WD
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Diagnostic Navigation
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Vehicle Diagnostic Information
🢒 Power Moding Schematics
Figure
1:
Ignition I Voltage and 12-Volt Reference
Figure
2:
Ignition II/III Voltage
Figure
3:
Ignition III Voltage and Accessory Voltage