DTC 03

Component Location:

General Description
When one of the front or rear directional lamps has malfunctioned (Lamp failure), the turn signal blinks at twice than the normal frequency ("double blinking"). The double blinking works at IGN2 ON condition.
1. Flasher fault detection should be inhibited by battery voltage status. When the VBAT voltage is lower than 11 V (8 V), Fault detection for front LED (Lamp) type should be inhibited.
2. If fault is detected, BCM keep the fault condition until flasher triggering condition is released. (Turn signal switch off/IGN2 or Hazard switch off)

NOTE: Double blinking for Hazard: If any error condition (related to Hazard lamp) is detected, the double blinking is triggered except for side lamp. Period: More than 120 Cycle/min

DTC Description
The BCM sets DTC "DIRECTION LAMP MALFUNCTION" if turn signal lamp failures are detected.

DTC Detecting Condition:

Schematic Diagram:

Component Inspection

Check Direction Lamps
1. Check direction lamps.

2. Are turn lamps normal?

YES - Go to "W/Harness Inspection" procedure.

NO - Replace turn lamps and Go to "Verification of Vehicle Repair" procedure.

Terminal and Connector Inspection
1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Check the following conditions:
1. Check for damaged harness and terminals: contact resistance, oxidation, bent or broken terminals.
2. Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks and poor terminal to wire connection

NOTE: Using a suitable male pin to ensure that contact in sockets is good. The pin should remain in position when pulled gently.

3. Has a problem been found?

YES - Repair as necessary and go to "Verification of Vehicle Repair" procedure

NO - Go to "Signal Circuit Inspection" procedure

Signal Circuit Inspection
1. Ignition "ON" and engine "ON"
2. Connect scantool and select ACTUATION test function.
3. Do actuation test of "TURN SIGNAL LAMP LH (RH)" parameter on the scantool.

Specification : 3 sec ON, 1 sec OFF one time

4. Are direction lamps activated within specification?

YES - Repair open in harness and then go to "Verification of Vehicle Repair" procedure

NO - Go to "Power Circuit Inspection" procedure

Power Supply Circuit Inspection
1. Ignition "OFF"
2. Disconnect BCM connector.
3. Measure voltage between terminal "8" of BCM harness connector and chassis ground.

Specification : Approx. B+

4. Is measured voltage within specifications?

YES - Go to "BCM Inspection" procedure.

NO - Check for a T/SIG fuse and an open in power supply circuit. Repair as necessary and then go to "Verification of Vehicle Repair"

BCM Inspection

Check Input Signal
1. Ignition "ON" and engine "OFF"
2. Connect scantool and select INPUT/OUTPUT MONITORING.
3. Monitor "TURN SIGNAL LAMP SW LH(RH)" parameter on the scantool.

Specification : "ON" when TURN SIGNAL LAMP is switched on.

4. Are parameters displayed within specifications?

YES - Substitute with a known-good BCM and check proper operation. If the problem is corrected, replace BCM and then go to "Verification of Vehicle Repair" procedure.

NO - Check for LIN communication line and a combination switch. Repair as necessary and then go to "Verification of Vehicle Repair"

Verification of Vehicle Repair
After a repair, it is essential to verify that the fault has been corrected.
1. Ignition "ON" & Engine "OFF".
2. Connect scantool and clear DTC.
3. Are any DTCs present?

YES - Go to the applicable troubleshooting procedure.

NO - System is performing to specification at this time.