Envoy 2WD V8-5.3L (2007)
Step 1 - Step 10
The numbers below refer to the step numbers on the diagnostic table.
2. A current DTC, U1300 or U1301, may be retrieved only from the engine control module (ECM), because the ECM is connected to both class 2
and high speed GMLAN buses, but it communicates with the scan tool on high speed GMLAN bus only.
3. A partial malfunction in the class 2 serial data circuit uses a different procedure from a total malfunction of the class 2 serial data circuit. The scan
tool communicates with the following modules on the class 2 serial data circuit:
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The body control module (BCM)
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The communication interface module (OnStar(R)), w/UE1
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The digital radio receiver (DRR), w/U2K
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The driver door module (DDM)
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The driver seat module (DSM), w/AAB
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The DVD player
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The electronic brake control module (EBCM)
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The end gate module (EGM), for XUV
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The HVAC control module
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The HVAC control module - rear auxiliary
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The inflatable restraint sensing and diagnostic module (SDM)
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The instrument panel cluster (IPC)
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The liftgate control module (LGM)
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The passenger door module (PDM)
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The radio
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The transfer case shift control module (TCSCM), w/4WD
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The theft deterrent control module (VTD), w/BAE
