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08 avalanche power steps have no power fuse good

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  • Cars & Trucks Master
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Do you know there is a electronic control module for the power steps ? assist step control module !

Circuit/System Description
The assist step control module (ASC) controls the assist step actuators to extend or retract the assist steps. Each actuator consists of an electric motor and a potentiometer. The module supplies a low reference and 10-volt reference source voltage to the potentiometer. The ASC module monitors the voltage drop across the potentiometer on the position signal circuit. When the actuator shaft rotates, the voltage on the position signal circuit changes. The ASC module supplies the actuator motor with a 12-volt control circuit and a ground control circuit. The ASC module controls the direction of the actuator by changing the polarity of the control circuits.

Do you know how to test electric circuits with a DVOM ?
Circuit/System Testing
ASC Disable Switch Circuit Test
Ignition OFF, disconnect the harness connector at the IP multifunction switch.
Test for less than 10 ohms between the listed ground circuit terminal and ground.
• X88/Z88 Terminal 3
• Z75 terminal 1
? If greater than the specified range, test the ground circuit for an open/high resistance.
Ignition ON, verify the scan tool ASC Disable Switch parameter is Inactive.
? If not the specified value, test the signal circuit terminal 9 for a short to ground. If the circuit tests normal, replace the ASC module.
Install a 3A fused jumper wire between the signal circuit terminal 9 and ground. Verify the scan tool ASC Disable Switch parameter is Active.
? If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ASC module.
If all circuits test normal, test or replace the IP multifunction switch.
ASC Actuator Circuit Test
Ignition OFF, disconnect the harness connector at the appropriate actuator.
Scan tool disconnected, test for less than 20 ohms between the low reference circuit terminal C and ground.
? If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ASC module.
Ignition ON, command the appropriate actuator with a scan tool while using the DMM Min/Max function to capture voltage. Test for greater than 9 volts between the 10-volt reference circuit terminal D and ground.
? If less than the specified range, test the 10-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ASC module.
Command the appropriate actuator with a scan tool while using the DMM Min/Max function to capture voltage. Test for greater than 9 volts between the signal circuit terminal E and ground.
? If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ASC module.
Using a scan tool, command the appropriate actuator both directions while using the DMM Min/Max function to capture voltage. Test for greater than 2 volts between the control circuit terminal A and ground.
? If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ASC module.
Using a scan tool, command the appropriate actuator both directions while using the DMM Min/Max function to capture voltage. Test for greater than 2 volts between the control circuit terminal B and ground.
? If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ASC module.
If all circuits test normal, replace the ASC actuator.

Posted on Nov 24, 2016

  • Guy Steadham
    Guy Steadham Nov 24, 2016

    Thank you this helped alot

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