Circuit/System Testing

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Refer to SIR Service Precautions .

When removing connectors, inspect for damage or corrosion or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector:

The front end sensor
The SDM module
The front end sensor wiring harness connector
The SDM wiring harness connector

Verify that DTC B0101, B0102, B0104, or B0105 are not set.
- If DTC B0101 or B0102 is set replace the left EFS. If the DTC resets, replace the SDM.
- If DTC B0104 or B0105 is set replace the right EFS. If the DTC resets, replace the SDM.
Ignition OFF, disconnect the harness connector at the appropriate front end sensor and the harness connector at the SDM.
- If DTC B0100 is set disconnect the left EFS
- If DTC B0103 is set disconnect the right EFS
Test for less than 1 volt between the signal circuit terminal 1 and ground.
- If greater than the specified range, test the signal circuit for a short to voltage.
Test for infinite resistance between the signal circuit terminal 1 and ground.
- If greater than the specified range, test the signal circuit short to ground.
Test for less than 1 ohm between the low reference circuit terminal 2 and the SDM connector terminal listed below:
- If DTC B0100 is set, SDM terminal 26
- If DTC B0103 is set, SDM terminal 27
- If greater than the specified range, test the low reference circuit for an open/high resistance.
Connect the SDM and EFS connectors.
Verify that DTC B0100 or B0103 are not set.
- If DTC B0100 is set replace the left EFS. If the DTC resets, replace the SDM.
- If DTC B0103 is set replace the right EFS. If the DTC resets, replace the SDM.