DTC C0023:14 [REAR BODY CONTROL MODULE (RBCM)]

id0902p4015100

Description

Brake light circuit malfunction
Detection condition
•  Rear body control module (RBCM) detects any of the following conditions:
―  Brake lights/high-mount brake light illuminated even though driver or system does not illuminate brake lights/high-mount brake lights.
―  Brake lights/high-mount brake light not illuminated even though driver depresses brake pedal.
―  Brake lights/high-mount brake light not illuminated even though system illuminates brake lights/high-mount brake light.
Fail-safe function
Not applicable
Possible cause
•  Brake light bulb (LH) malfunction (with brake light (bulb type))
•  Brake light bulb (RH) malfunction (with brake light (bulb type))
•  Rear combination light (LH) connector or terminal malfunction
•  Open circuit in wiring harness between rear combination light (LH) terminal F and body ground
•  Rear combination light (RH) connector or terminal malfunction
•  Open circuit in wiring harness between rear combination light (RH) terminal F and body ground
•  Liftgate light (LH) connector or terminal malfunction (with brake light (liftgate light))
•  Open circuit in wiring harness between rear liftgate light (LH) terminal D and body ground (with brake light (liftgate light))
•  Liftgate light (RH) connector or terminal malfunction (with brake light (liftgate light))
•  Open circuit in wiring harness between rear liftgate light (RH) terminal D and body ground (with brake light (liftgate light))
•  High-mount brake light connector or terminal malfunction
•  Open circuit in wiring harness between high-mount brake light terminal A and body ground
•  Brake light unit connector or terminal malfunction
•  Rear body control module (RBCM) connector or terminal malfunction
•  Short to ground in wiring harness between the following terminals:
―  Rear body control module (RBCM) terminal 4D—Rear combination light (LH) terminal B
―  Rear body control module (RBCM) terminal 4D—Rear combination light (RH) terminal B
―  Rear body control module (RBCM) terminal 4D—Liftgate light (LH) terminal C (with brake light (liftgate light))
―  Rear body control module (RBCM) terminal 4D—Liftgate light (RH) terminal C (with brake light (liftgate light))
―  Rear body control module (RBCM) terminal 4D—Brake light unit terminal J
―  High-mount brake light terminal B—Brake light unit terminal G
•  Short to power supply in wiring harness between the following terminals:
―  Rear body control module (RBCM) terminal 4D—Rear combination light (LH) terminal B
―  Rear body control module (RBCM) terminal 4D—Rear combination light (RH) terminal B
―  Rear body control module (RBCM) terminal 4D—Liftgate light (LH) terminal C (with brake light (liftgate light))
―  Rear body control module (RBCM) terminal 4D—Liftgate light (RH) terminal C (with brake light (liftgate light))
―  Rear body control module (RBCM) terminal 4D—Brake light unit terminal J
―  High-mount brake light terminal B—Brake light unit terminal G
•  Open circuit in wiring harness between the following terminals:
―  Rear body control module (RBCM) terminal 4D—Rear combination light (LH) terminal B
―  Rear body control module (RBCM) terminal 4D—Rear combination light (RH) terminal B
―  Rear body control module (RBCM) terminal 4D—Liftgate light (LH) terminal C (with brake light (liftgate light))
―  Rear body control module (RBCM) terminal 4D—Liftgate light (RH) terminal C (with brake light (liftgate light))
―  Rear body control module (RBCM) terminal 4D—Brake light unit terminal J
―  High-mount brake light terminal B—Brake light unit terminal G
•  Liftgate light (LH) malfunction (with brake light (liftgate light))
•  Liftgate light (RH) malfunction (with brake light (liftgate light))
•  Rear combination light (LH) malfunction
•  Rear combination light (RH) malfunction
•  High-mount brake light malfunction
•  Brake light unit malfunction
•  Rear body control module (RBCM) malfunction

*1  :With brake light (rear combination light) (bulb type)
*2  :With brake light (rear combination light) (LED type)
*3  :With brake light (liftgate light)

Diagnostic Procedure

Step

Inspection

Action
1
VERIFY REAR BODY CONTROL MODULE (FBCM) DTCs AGAIN
•  Clear the DTC for the rear body control module (RBCM) using the M-MDS.
•  Depress the brake pedal.
•  Retrieve the rear body control module (RBCM) DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
•  With brake light (bulb type)
―  Go to the next step.
•  With brake light (LED type)
―  Go to Step 4.
No
Go to Step 23.
2
INSPECT BRAKE LIGHT BULB (LH)
•  Inspect the brake light bulb (LH).
•  Is the brake light bulb (LH) normal?
Yes
Go to the next step.
No
Replace the brake light bulb (LH), then go to Step 22.
(See BRAKE LIGHT BULB REMOVAL/INSTALLATION.)
3
INSPECT BRAKE LIGHT BULB (RH)
•  Inspect the brake light bulb (RH).
•  Is the brake light bulb (RH) normal?
Yes
Go to the next step.
No
Replace the brake light bulb (RH), then go to Step 22.
(See BRAKE LIGHT BULB REMOVAL/INSTALLATION.)
4
REAR COMBINATION LIGHT (LH) CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  Disconnect the rear combination light (LH) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 22.
5
INSPECT FOR OPEN CIRCUIT IN BRAKE LIGHT (LH) (COMBINATION LIGHT (LH)) GROUND CIRCUIT
•  Verify that the rear combination light (LH) connector is disconnected.
•  Inspect for continuity between rear combination light (LH) terminal F (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between rear combination light (LH) terminal F and body ground.
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 22.
6
INSPECT REAR COMBINATION LIGHT (RH) CONNECTOR CONDITION
•  Disconnect the rear combination light (RH) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 22.
7
INSPECT FOR OPEN CIRCUIT IN BRAKE LIGHT (RH) (COMBINATION LIGHT (RH)) GROUND CIRCUIT
•  Verify that the rear combination light (LH) connector is disconnected.
•  Inspect for continuity between rear combination light (RH) terminal F (wiring harness-side) and body ground.
•  Is there continuity?
Yes
•  With brake light (liftgate light)
―  Go to the next step.
•  Without brake light (liftgate light)
―  Go to Step 12.
No
Refer to the wiring diagram and verify whether or not there is a common connector between rear combination light (RH) terminal F and body ground.
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 22.
8
INSPECT LIFTGATE LIGHT (LH) CONNECTOR CONDITION
•  Disconnect the liftgate light (LH) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 22.
9
INSPECT FOR OPEN CIRCUIT IN BRAKE LIGHT (LH) (LIFTGATE LIGHT (LH)) GROUND CIRCUIT
•  Verify that the liftgate light (LH) connector is disconnected.
•  Inspect for continuity between liftgate light (LH) terminal D (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between liftgate light (LH) terminal D and body ground.
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 22.
10
INSPECT LIFTGATE LIGHT (RH) CONNECTOR CONDITION
•  Disconnect the liftgate light (RH) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 22.
11
INSPECT FOR OPEN CIRCUIT IN BRAKE LIGHT (RH) (LIFTGATE LIGHT (RH)) GROUND CIRCUIT
•  Verify that the liftgate light (RH) connector is disconnected.
•  Inspect for continuity between liftgate light (RH) terminal D (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between liftgate light (RH) terminal D and body ground.
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 22.
12
INSPECT HIGH-MOUNT BRAKE LIGHT CONNECTOR CONDITION
•  Disconnect the high-mount brake light connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 22.
13
INSPECT FOR OPEN CIRCUIT IN HIGH-MOUNT BRAKE LIGHT GROUND CIRCUIT
•  Verify that the high-mount brake light connector is disconnected.
•  Inspect for continuity between high-mount brake light terminal A (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between high-mount brake light terminal A and body ground.
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 22.
14
INSPECT BRAKE LIGHT UNIT CONNECTOR CONDITION
•  Disconnect the brake light unit connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 22.
15
INSPECT REAR BODY CONTROL MODULE (RBCM) CONNECTOR CONDITION
•  Disconnect the rear body control module (RBCM) connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 22.
16
INSPECT BRAKE LIGHT CIRCUIT FOR SHORT TO GROUND
•  Verify that the rear combination light (LH), rear combination light (RH), liftgate light (LH), liftgate light (RH) (with brake light (liftgate light)), brake light unit and rear body control module (RBCM) connectors are disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:
―  Rear body control module (RBCM) terminal 4D
―  High-mount brake light terminal B
•  Is there continuity?
Yes
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  Rear body control module (RBCM) terminal 4D—Rear combination light (LH) terminal B
•  Rear body control module (RBCM) terminal 4D—Rear combination light (RH) terminal B
•  Rear body control module (RBCM) terminal 4D—Liftgate light (LH) terminal C (with brake light (liftgate light))
•  Rear body control module (RBCM) terminal 4D—Liftgate light (RH) terminal C (with brake light (liftgate light))
•  Rear body control module (RBCM) terminal 4D—Brake light unit terminal J
•  High-mount brake light terminal B—Brake light unit terminal G
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to ground.
Go to Step 22.
No
Go to the next step.
17
INSPECT FOR SHORT TO POWER SUPPLY IN BRAKE LIGHT CIRCUIT
•  Verify that the rear combination light (LH), rear combination light (RH), liftgate light (LH) , liftgate light (RH) (with brake light (liftgate light)), brake light unit and rear body control module (RBCM) connectors are disconnected.
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off or on).
•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:
―  Rear body control module (RBCM) terminal 4D
―  High-mount brake light terminal B
•  Is the voltage 0 V?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  Rear body control module (RBCM) terminal 4D—Rear combination light (LH) terminal B
•  Rear body control module (RBCM) terminal 4D—Rear combination light (RH) terminal B
•  Rear body control module (RBCM) terminal 4D—Liftgate light (LH) terminal C (with brake light (liftgate light))
•  Rear body control module (RBCM) terminal 4D—Liftgate light (RH) terminal C (with brake light (liftgate light))
•  Rear body control module (RBCM) terminal 4D—Brake light unit terminal J
•  High-mount brake light terminal B—Brake light unit terminal G
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to power supply.
Go to Step 22.
18
INSPECT FOR OPEN CIRCUIT BRAKE LIGHT CIRCUIT
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  Verify that the rear combination light (LH), rear combination light (RH), liftgate light (LH) , liftgate light (RH) (with brake light (liftgate light)), brake light unit and rear body control module (RBCM) connectors are disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side):
―  Rear body control module (RBCM) terminal 4D—Rear combination light (LH) terminal B
―  Rear body control module (RBCM) terminal 4D—Rear combination light (RH) terminal B
―  Rear body control module (RBCM) terminal 4D—Liftgate light (LH) terminal C
―  Rear body control module (RBCM) (with brake light (liftgate light)) terminal 4D—Liftgate light (RH) terminal C (with brake light (liftgate light))
―  Rear body control module (RBCM) terminal 4D—Brake light unit terminal J
―  High-mount brake light terminal B—Brake light unit terminal G
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  Rear body control module (RBCM) terminal 4D—Rear combination light (LH) terminal B
•  Rear body control module (RBCM) terminal 4D—Rear combination light (RH) terminal B
•  Rear body control module (RBCM) terminal 4D—Liftgate light (LH) terminal C (with brake light (liftgate light))
•  Rear body control module (RBCM) terminal 4D—Liftgate light (RH) terminal C (with brake light (liftgate light))
•  Rear body control module (RBCM) terminal 4D—Brake light unit terminal J
•  High-mount brake light terminal B—Brake light unit terminal G
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 22.
19
INSPECT BRAKE LIGHT
•  Reconnect the rear combination light (LH), rear combination light (RH), liftgate light (LH) , liftgate light (RH) (with brake light (liftgate light)) and rear body control module (RBCM) connectors.
•  Verify that the brake light unit connector is disconnected.
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off or on).
•  Turn on/off the brake light using simulation item STOP_LMP_CS.
•  Are there any lights among the following which are not turned on/off according to the simulation operation?
―  Brake light (LH) (rear combination light (LH))
―  Brake light (RH) (rear combination light (RH))
―  Brake light (LH) (liftgate light (LH)) (with brake light (liftgate light))
―  Brake light (RH) (liftgate light (RH)) (with brake light (liftgate light))
Yes
If the brake light (LH) (rear combination light (LH)) does not turn on/off:
•  Replace the rear combination light (LH).
If the brake light (RH) (rear combination light (RH)) does not turn on/off:
•  Replace the rear combination light (RH).
If the brake light (LH) (liftgate light (LH)) does not turn on/off:
•  Replace the liftgate light (LH).
If the brake light (RH) (liftgate light (RH)) does not turn on/off:
•  Replace the liftgate light (RH).
Go to Step 22.
No
Go to the next step.
20
PERFORM DTC INSPECTION AND VERIFY REAR HIGH-MOUNT BRAKE LIGHT MALFUNCTION
•  Always reconnect all disconnected connectors.
•  Reconnect the negative battery terminal.
•  Clear the DTC for the rear body control module (RBCM) using the M-MDS.
•  Depress the brake pedal.
•  Retrieve the rear body control module (RBCM) DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Replace the high-mount brake light, then go to the next step.
(See HIGH-MOUNT BRAKE LIGHT REMOVAL/INSTALLATION.)
No
Go to Step 23.
21
INSPECT BRAKE LIGHT UNIT
•  Inspect the brake light unit.
•  Is the brake light unit normal?
Yes
Go to the next step.
No
Replace the brake light unit, then go to the next step.
(See BRAKE LIGHT UNIT REMOVAL/INSTALLATION.)
22
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Always reconnect all disconnected connectors.
•  Reconnect the negative battery terminal.
•  Clear the DTC for the rear body control module (RBCM) using the M-MDS.
•  Depress the brake pedal.
•  Retrieve the rear body control module (RBCM) DTCs using the M-MDS.
•  Is the same DTC displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the rear body control module (RBCM).
Go to the next step.
No
Go to the next step.
23
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.
(See DTC TABLE [REAR BODY CONTROL MODULE (RBCM)].)
No
DTC troubleshooting completed.