C1065

DTC C1065: Brake Light Relay Circuit Failure

Wiring Diagram










DTC Detecting Condition and Trouble Area






DTC Troubleshooting

1.
Was "Electronic Stability Program Check" performed?
YES -
Go to Step 2.
NO -
Go to (ESP) Check Electronic Stability Program Check.

2. DTC check for ESP(R)

Connect scan tool to DLC with ignition switch turned OFF.
Turn ignition switch ON and check DTC for ESP(R).

Is DTC C1016 detected?
YES -
Go to DTC C1016 diag. flow.
NO -
Go to step 3.

3. Check brake light relay drive circuit

Turn ignition switch to OFF position.
Remove brake light relay from relay box.
Check for proper connection from connector to brake light relay.
If OK, measure voltage between "GRN/ORN" wire terminal and vehicle ground with ignition switch turned ON.

Is it 10 - 14 V?
YES -
Go to step 4.
NO -
"GRN/ORN" wire circuit open.

4. Check brake light relay power supply circuit

Turn ignition switch to OFF position.
Measure voltage between "GRN" wire terminal and vehicle ground.

Is it 10 - 14 V?
YES -
Go to step 5.
NO -
"GRN" wire circuit open.

5. Check brake light relay power supply circuit

Measure voltage between "GRN/YEL" wire terminal and vehicle ground, when brake light switch ON and brake light switch OFF.

Brake light switch ON: 10 - 14 V? Brake light switch OFF: 0 V?
YES -
Step 6
NO -
Repair or replace "GRN/YEL" wire.

6. Check brake light relay

Check brake light relay. (Brake Light Relay Inspection) OFF

Is it good condition?
YES -
Go to step 7.
NO -
Replace brake light relay.

7. Check brake light relay drive circuit

Turn ignition switch to OFF position.
Disconnect ESP(R) control module connector.
Check brake light relay drive circuit is as follows.
- Wiring resistance of "BLK/ORN" wire between brake light relay and ESP(R) control module connector is less than 1 ohms.
- Insulation resistance of "BLK/ORN" wire is infinity between its terminal and other terminals at ESP(R) control module connector.
- Insulation resistance of "BLK/ORN" wire is infinity between its terminal and vehicle body ground.

Is it in good condition?
YES -
Go to step 8.
NO -
Repair or replace "BLK/ORN" wire.

8. Check brake light relay power supply circuit

Turn ignition switch to OFF position.
Check brake light relay signal circuit is as follows.
- Wiring resistance of "BLK/ORN" wire between brake light relay and Spear control module connector is less than 1 ohms.
- Insulation resistance of "GRN/WHT" wire is infinity between its terminal and other terminals at ESP(R) control module connector.
- Insulation resistance of "GRN/WHT" wire is infinity between its terminal and vehicle body ground.
- Voltage of "GRN/WHT" wire between ESP(R) control module connector terminal and vehicle body ground is 12 V with ignition switch turned ON.

Is it in good condition?
YES -
Substitute a known good ESP(R) control module and recheck.
NO -
Repair or replace "GRN/WHT" wire.