When the rear compartment lid release switch is pushed, the rear compartment lid release signal circuit to the body control module (BCM) is grounded. BCM then grounds the coil side of the trunk release relay through the trunk release relay control circuit. With this voltage is applied to the rear compartment lid release actuator, opening the rear compartment.
Rear Compartment Lid Release Relay
- Ignition OFF, disconnect the trunk relay.
- Test for 65-90 ohms of resistance between terminals 85 and 86.
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If the resistance is not within the specified range, replace the trunk relay.
- Test for infinite resistance between the following terminals:
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30 and 86
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30 and 87
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30 and 85
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85 and 87
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If less than infinite resistance, replace the relay.
- Install a 10-amp fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Measure for less than 2 ohms of resistance between terminals 30 and 87.
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If greater than 2 ohms, replace the relay.
Rear Compartment Lid Release Relay Malfunction
- Ignition OFF, disconnect the trunk relay.
- Verify that a test lamp illuminates between the coil side B+ circuit of the trunk relay and ground.
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If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the voltage control circuit for a short to ground. If the circuit tests normal, test or replace the trunk relay.
- Verify that a test lamp illuminates between the switch side B+ circuit of the trunk relay and ground.
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If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
- Disconnect the harness connector at the rear compartment lid latch.
- Ignition OFF, test for less than 5 ohm of resistance between the rear compartment lid latch ground circuit and ground.
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If greater than the specifed range, test the ground circuit for an open/high resistance.
- Connect a test lamp between the trunk release relay control circuit and the coil side B+ circuit of the trunk relay.
- Command the trunk release solenoid ON and OFF with a scan tool.
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If the test lamp remains ON all the time, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.
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If the test lamp remains OFF all the time, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
- Connect the harness connector at the rear compartment lid latch.
- Connect a 3-amp fused jumper wire between the switch side B+ circuit of the trunk relay and the voltage control circuit of the lid latch. Verify that the lid latch activates.
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If the lid latch does not activate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the rear compartment lid latch.
- If all circuits test normal, test or replace the trunk relay.
Component Testing
Rear Compartment Lid Release Switch
- Ignition OFF, disconnect the harness connector at the rear compartment lid release switch.
- Test for infinite resistance between the trunk release switch supply voltage and ground terminals with the switch in the open position.
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If less than infinite resistance, replace the rear compartment lid release switch.
- Test for less than 2 ohms of resistance between the trunk release switch supply voltage and ground terminals with the switch in the closed position.
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If greater than 2 ohms, replace the rear compartment lid release switch.
- Test for infinite resistance between each terminal and the lid release switch housing/case.
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If less than infinite resistance, replace the rear compartment lid release switch.
Could be the relay , could be the switch , could be a problem with the BCM !
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