Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2004 Isuzu Ascender 2WD L6-4.2LFACTORY OEM SERVICE PROCEDURE
Circuit Operation
Circuit Operation
The liftglass can be opened by any of the following components: Liftgate window release switch, Door lock cylinder switch, or Keyless entry transmitter.
When the liftgate window release switch is operated ground is applied to the body control module (BCM) and a liftglass release output is sent to the liftglass relay. An open output can also be commanded by the BCM when an open input is received from the remote control door lock receiver. When the BCM grounds the relay with a commanded open the liftglass relay coil energizes and the switch side of the relay closes. Battery voltage is then applied directly to the liftgate window release actuator. This will release the liftglass. The liftgate window release actuator can also be energized when the liftgate lock cylinder switch is operated.
The liftglass can be opened by any of the following components: Liftgate window release switch, Door lock cylinder switch, or Keyless entry transmitter.
When the liftgate window release switch is operated ground is applied to the body control module (BCM) and a liftglass release output is sent to the liftglass relay. An open output can also be commanded by the BCM when an open input is received from the remote control door lock receiver. When the BCM grounds the relay with a commanded open the liftglass relay coil energizes and the switch side of the relay closes. Battery voltage is then applied directly to the liftgate window release actuator. This will release the liftglass. The liftgate window release actuator can also be energized when the liftgate lock cylinder switch is operated.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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