DTC B3140 or B3150
Diagnostic Instructions
DTC Descriptors
DTC B3140 00: Driver Door Unlock Switch
Circuit
DTC B3150 00: Left Front Door Lock Switch
Circuit
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Central Door Lock Switch Lock Signal
|
B3150 00
|
1
|
1
|
--
|
Central Door Lock Switch Unlock Signal
|
B3140 00
|
2
|
2
|
--
|
Hazard Lamps Switch Earth
|
--
|
3
|
--
|
--
|
1. Door Lock Switch Lock Function Inoperative
2. Door Lock Switch Unlock Function Inoperative
3. Door Lock Switch Lock and Unlock Functions Inoperative
|
Circuit/System Description
The body control module (BCM) monitors the voltage level of the
door lock and door unlock signal circuits. When the central door
lock switch is in the open position, the voltage level in the
signal circuit will be near 12 V. When the central door lock
switch is pressed to the lock or unlock position, the voltage level
in the appropriate signal circuit will drop to 0V and the BCM will
detect the voltage drop and command the door latches to perform the
requested lock or unlock command.
Conditions for Running the DTC
The system voltage must be between 9-16 V.
Conditions for Setting the DTC
B3140 00
The BCM detects short to ground in the unlock signal circuit for
greater than 60 seconds.
B3150 00
The BCM detects a short to ground in the lock signal circuit for
greater than 60 seconds.
Action Taken When the DTC Sets
B3140 00
The BCM will ignore the unlock signal and the doors will not
unlock when using the central door lock switch.
B3150 00
The BCM will ignore the lock signal and the doors will not lock
when using the central door lock switch.
Conditions for Clearing the DTC
• |
The 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
Door Lock/Indicator Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Power Door Locks Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool BCM Central Door Lock Switch
on Console parameter. The reading should be Inactive and change to
Lock and Unlock when pushing the appropriate switch on the central
door lock switch.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the
S26 hazard lamps switch.
- Test for less than 5 Ω between the ground circuit
terminal 7 and ground.
⇒ |
If greater than the specified range, test the
ground circuit for an open/high resistance. |
- Ignition ON, verify the scan tool Central Door Lock
Switch on Center Console parameter is Inactive.
⇒ |
If the value is Lock, test the signal circuit
terminal 11 for a short to ground. If the circuit tests
normal, replace the K9 body control module. |
⇒ |
If the value is Unlock, test the signal circuit
terminal 9 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 11 and ground. Verify the scan tool
Central Door Lock Switch on Center Console parameter is Lock.
⇒ |
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. |
- Install a 3 A fused jumper wire between the
signal circuit terminal 9 and ground. Verify the scan tool
Central Door Lock Switch on Center Console parameter is
Unlock.
⇒ |
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
S26 hazard lamps switch.
Component Testing
Door Lock Switch Test
- Ignition OFF, disconnect the harness connector at the
S26 hazard lamps switch.
- Test for infinite resistance between the signal
terminal 9 and the ground terminal 7 with the switch in
the open position.
⇒ |
If not the specified value, replace the
S26 hazard lamps switch. |
- Test for infinite resistance between the signal
terminal 11 and the earth terminal 7 with the switch in
the open position
⇒ |
If not the specified value, replace the
S26 hazard lamps switch. |
- Test for less than 5 Ω between the signal
terminal 11 and the earth terminal 7 with the switch in
the LOCK position.
⇒ |
If greater than the specified range, replace the
S26 hazard lamps switch. |
- Test for less than 5 Ω between the signal
terminal 9 and the earth terminal 7 with the switch in
the UNLOCK position.
⇒ |
If greater than the specified range, replace the
S26 hazard lamps switch. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the repair.
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