DTC B3618
Diagnostic Instructions
DTC Descriptor
DTC B3618 00: Exterior Liftgate Unlatch
Switch Circuit Malfunction
Diagnostic Fault Information
|
Circuit
|
Short to Ground
|
Open/High Resistance
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Short to Voltage
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Signal Performance
|
|
Rear Compartment Lid Exterior Release Switch Signal
|
B3618 00
|
1
|
1
|
--
|
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Rear Compartment Lid Exterior Release Switch Ground
|
--
|
1
|
--
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--
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1. Boot Release Malfunction
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Circuit/System Description
The exterior rear compartment lid release switch receives a
signal from the body control module (BCM). When the exterior rear
compartment lid release switch is activated the signal circuit is
pulled to ground. The BCM applies battery positive voltage to the
boot release relay control circuit which energises the relay. The
boot release relay is grounded at all times. With the relay coil
energised, the relay switch contacts close allowing battery voltage
to flow to the rear compartment lid release actuator causing the
rear compartment lid to release.
Conditions for Running the DTC
Battery voltage must be between 9-16 V.
Conditions for Setting the DTC
The BCM detects a fault in the exterior boot release switch
signal circuit.
Action Taken When the DTC Sets
The rear compartment latch will not operate.
Conditions for Clearing the DTC
| • |
This DTC will be current for as long as the fault
is present. |
| • |
When the fault is no longer present, the DTC will
be a history DTC. |
| • |
A history DTC will clear after 50 ignition
cycles. |
Reference Information
Schematic Reference
Release Systems Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Luggage Compartment Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Command the boot release by using the exterior rear compartment
lid release switch. The rear compartment lid release actuator
should release the boot lid.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the
S46 Tailgate Handle Switch.
- Test for less than 10 Ω between the ground
circuit terminal 3 and ground.
| ⇒ |
If greater than the specified range, test the
ground circuit for an open/high resistance. |
- Ignition ON, verify the scan tool Rear Body Closure
Unlatch Command parameter is Inactive.
| ⇒ |
If not the specified value, test the signal
circuit for a short to ground. If the circuit tests normal, replace
the K9 Body Control Module. |
- Install a 3 A fused jumper wire between the
signal circuit terminal 1 and ground. Verify the scan tool
Rear Body Closure Unlatch Command parameter changes briefly to
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 K9 Body Control Module. |
- If all circuits test normal, test or replace the
S46 Tailgate Handle Switch.
Component Testing
Static Test
- Ignition OFF, disconnect the harness connector at the
S46 Tailgate Handle Switch.
- Test for infinite resistance between the signal
terminal 1 and the ground terminal 3 with the switch in
the released position.
| ⇒ |
If not within the specified range, replace the
S46 Tailgate Handle Switch. |
- Test for less than 5 Ω between the signal
terminal 1 and the ground terminal 3 with the switch in
the pressed position.
| ⇒ |
If less than the specified value, replace the
S46 Tailgate Handle Switch. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
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