Fuel Filler Door Release Malfunction
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Fuel Filler Door Release Malfunction
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Diagnostic Fault Information
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Circuit
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Short to Ground
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Open/High Resistance
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Short to Voltage
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Signal Performance
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Fuel Door Lock Relay Control
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B3938 02
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B3938 04
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B3938 01
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-
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Fuel Door Latch Lock Control
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1
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1
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1
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-
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Fuel Door Latch Unlock Control
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B3125 02, B3130 02, B3135 02
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1
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1
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-
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Rear Fuse Block Ground
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-
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B3938 04
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-
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-
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1. Fuel Door Latch Malfunction
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Circuit/System Description
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The locking and unlocking of the fuel door is a function of the power door lock system. The fuel door unlatch actuator shares the circuit with the door latch unlock control circuit. The body control module (BCM), upon receipt of a lock switch lock or unlock signal, will switch the appropriate door latch, as well as a fuel filler door unlatch actuator control circuits to B+ voltage. The opposing side of the door latch and fuel filler door unlatch actuator is connected to ground provided by the BCM through the other the door latch control circuits, along with the fuel filler door unlatch actuator, will lock or unlock as commanded.
Schematic Reference
Release Systems Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Fuel Fill Door Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References
for scan tool information
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Circuit/System Verification
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1.
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Command the door latches to LOCK and UNLOCK with a scan tool, Each interior door lock knob should move between LOCK and UNLOCK.
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3.
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Command the door latches to LOCK and UNLOCK with a scan tool, the M27 fuel door release actuator should LOCK and UNLOCK while changing between the commanded states.
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1.
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Ignition OFF, disconnect the X2 harness connector at the X53 fuse block-rear.
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2.
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Connect a test lamp between the control circuit terminal 31 and ground.
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3.
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Command the door latches to LOCK with a scan tool, the test lamp should briefly illuminate while commanding the LOCK state.
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4.
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If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
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5.
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If the test lamp is always OFF, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the K9 BCM.
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6.
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Ignition OFF, connect the X2 harness connector at the X53 fuse block-rear and disconnect the M27 fuel door release actuator.
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7.
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Connect a test lamp between the control circuit terminal 1 and ground.
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8.
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Command the door latches to UNLOCK with a scan tool, the test lamp should briefly illuminate while commanding the UNLOCK state.
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11.
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Connect a test lamp between the control circuit terminal 2 and ground.
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12.
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Command the door latches to LOCK with a scan tool, the test lamp should briefly illuminate while commanding the LOCK state.
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13.
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If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the X53 fuse block-rear.
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14.
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If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the X53 fuse block-rear.
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15.
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If all circuits test normal, test or replace the M27 fuel door release actuator.
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Fuel door latch
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1.
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Ignition OFF, disconnect the harness connector at the M27 fuel door release actuator.
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2.
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Install a 25 A fused jumper wire between one of the control terminals and 12 V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the M27 fuel door release actuator should perform the LOCK and UNLOCK functions.
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3.
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If it does not perform as specified, replace the M27 fuel door release actuator.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
