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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Door Lock Signal
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B3135 02
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1
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1
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-
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Fuel Door Relay Coil Signal
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B3938 02
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1
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1
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-
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Fuel Door Relay Switch Signal
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B3130 02
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1
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1
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-
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Fuel Door Actuator Control
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B3130 02
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1
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1
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-
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Fuel Door Relay Coil Ground
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1
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1
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1
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-
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1. Fuel Door Unlatch 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 is supplied by the door lock signal circuit and the driver door unlock signal circuit which is switched through the fuel door relay. The fuel door relay coil is controlled by the body control module (BCM). When the vehicles doors are unlocked, the body control module (BCM) will respond by applying voltage to the fuel door relay coil control circuit. This energizes the coil causing the switch contacts to close. With the switch contacts closed, the driver door unlock circuit supplies B+ or ground to the fuel door unlatch actuator , unlocking the fuel door.
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 information on diagnostic tools
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Circuit/System Verification
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Observe the operation of the power door locks and fuel filler door while using the power door lock switch. The fuel filler door should Lock and Unlock as commanded along with the door locks.
If the power door locks do not lock and unlock, refer to
Symptoms - Vehicle Access
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1.
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Ignition OFF, disconnect the X2 connector at the X53A Fuse Block - Rear Body.
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2.
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Test for greater than 5 Ω between the ground circuit terminal 36 X2 and ground.
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3.
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If greater than the specified range, test the ground circuit for an open/high resistance.
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4.
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Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 5 X2 and ground.
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5.
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If the test lamp illuminates, test the control circuit for a short to voltage.
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6.
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Press the door unlock button on the door lock switch and verify that a test lamp illuminates between the control circuit terminal 5 X2 and ground.
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7.
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If the test lamp does not illuminate, test the control circuit for an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
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8.
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Connect a 15 A fused jumper wire between the door unlock control circuit terminal 28 X2 and the control circuit terminal 13 X2. Verify the M27 Fuel Door Unlatch Actuator is activated when the door unlock switch is pressed.
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9.
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If the M27 Fuel Door Unlatch Actuator does not activate, test the control circuits for an open/high resistance. If the circuit tests normal, test or replace the M27 Fuel Door Unlatch Actuator.
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10.
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If all circuits test normal, replace the X53A Fuse Block - Rear Body.
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Fuel Door Unlatch Actuator Test
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1.
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Ignition OFF, disconnect the harness connector at the M27 Fuel Door Unlatch Actuator.
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2.
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Connect a bridging connector, protected with a 25 amp fuse, between the locking control terminal 2 and 12 V. Briefly make and break a connection between control terminal 1 and ground. The M27 fuel filler cap release actuator should lock and unlock.
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3.
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If the function does not perform as specified, replace the M27 Fuel Door Unlatch Actuator.
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4.
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Reverse the jumper wires; the M27 Fuel Door Unlatch Actuator should perform the Unlock/Lock function.
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5.
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If the function does not perform as specified, replace the M27 Fuel Door Unlatch Actuator.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
