DTC B3881 or B3882
Diagnostic Instructions
DTC Descriptors
| DTC B3881 02: Tail Lamp Circuit Short to
Ground |
| DTC B3881 04: Tail Lamp Circuit Open |
| DTC B3882 02: Right Tail Lamp Circuit Short to
Ground |
| DTC B3882 04: Right Tail Lamp Circuit
Open |
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Tail Lamp Control
|
B3881 02
|
B3881 04
|
1
|
-
|
Right Tail Lamp Control
|
B3882 02
|
B3882 04
|
1
|
-
|
1. Tail Lamps Always ON
|
|
| |
Circuit/System Description
The headlamp switch is supplied with ground at all times. When
the headlamp switch is placed in either the park or low beam
position, ground is applied to the Tail lamp signal circuit to the
body control module (BCM). The BCM responds by applying battery
voltage to the left and to the right tail lamp control circuits.
This energizes the tail lamps.
Conditions for Running the DTC
B3881 02, B3882 02, B3881 04 or B3882 04
The headlamp switch is in park or low beam position.
Conditions for Setting the DTC
B3881 02 or B3882 02
The BCM detects a short to ground on the control circuit.
B3881 04 or B3882 04
The BCM detects an open control circuit.
Action Taken When the DTC Sets
The appropriate tail lamp is inoperative.
Conditions for Clearing the DTC
The condition for setting the DTC is no longer present.
Reference Information
Schematic Reference
Exterior Lights Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Exterior Lighting Systems Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, perform the appropriate Rear Park Lamp test. The
appropriate tail lamp should be ON/OFF.
Circuit/System Testing
| 1. |
Ignition OFF, disconnect the
appropriate harness connector at the tail lamp listed below:
|
| |
• |
E42L Tail Lamp Assembly -
Left |
| |
• |
E42R Tail Lamp Assembly -
Right |
| |
• |
E43L Liftgate Tail Lamp
Assembly - Left |
| |
• |
E43R Liftgate Tail Lamp
Assembly - Right |
| 2. |
Disconnect the negative
terminal of the C1 Battery. |
| 3. |
Test for less than 5 Ω
between the appropriate ground circuit harness connector terminal
listed below and ground: |
| |
• |
E42L Tail Lamp Assembly - Left
harness connector terminal B |
| |
• |
E42R Tail Lamp Assembly -
Right harness connector terminal C |
| |
• |
E43L Liftgate Tail Lamp
Assembly - Left harness connector terminal 3 |
| |
• |
E43R Liftgate Tail Lamp
Assembly - Right harness connector terminal 2 |
| ⇒ |
If greater than the specified value, test the appropriate
ground circuit for an open/high resistance. |
| 4. |
Reconnect the negative
terminal of the C1 Battery. |
| 5. |
Connect a test lamp between
the appropriate control circuit harness connector terminal listed
below and ground: |
| |
• |
E42L Tail Lamp Assembly - Left
harness connector terminal A |
| |
• |
E42R Tail Lamp Assembly -
Right harness connector terminal D |
| |
• |
E43L Liftgate Tail Lamp
Assembly - Left harness connector terminal 2 |
| |
• |
E43R Liftgate Tail Lamp
Assembly - Right harness connector terminal 3 |
| 6. |
Command the appropriate Rear
Park Lamp test with a scan tool. The test lamp should turn ON and
OFF when changing between the commanded states. |
| ⇒ |
If the test lamp is always ON, test the
appropriate control circuit for a short to voltage. If the circuit
tests normal, replace the K9 Body Control Module. |
| ⇒ |
If the test lamp is always OFF, test the
appropriate control circuit for a short to ground or an open/high
resistance. If the circuit tests normal, replace the K9 Body
Control Module. |
| 7. |
If all circuits test normal,
test or replace the appropriate tail lamp. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
