DTC 4
DTC 4 IMMOBILIZER ANTENNA ERROR - OPENComponent Location:
GENERAL DESCRIPTION
This wireless communication runs on RF (Radio Frequency). The BCM (Body Control Module) communicates a transponder through a antenna coil.
DTC DESCRIPTION
This DTC indicates that Antenna coil circuit is open.
DTC Detecting Condition:
Schematic Diagram:
MONITOR SCANTOOL DATA
1. Ignition "ON" & Engine "OFF".
2. Select Diagnostic Trouble Codes (DTCs)" mode and Clear the DTC.
3. Is the DTC erased?
YES
- Fault is intermittent caused by poor contact in the BCM and/or the antenna coil connector or was repaired and BCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
- Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
NO - Go to "W/Harness Inspection" 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. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?
YES - Repair as necessary and go to "Verification of Vehicle Repair" procedure.
NO - Go to "Power Circuit Inspection" procedure.
SIGNAL CIRCUIT INSPECTION
1. Check for open in harness
1. Ignition "OFF".
2. Disconnect BCM and ECM connector
3. Measure resistance between terminal 20 of the BCM harness connector and terminal 3 of the ECM harness connector.
Specification : Approx. below 1 ohm
4. Is the measured resistance within specifications?
YES - Go to "Component Inspection" procedure.
NO
- Check for open in signal harness.
- Repair as necessary and go to "Verification of Vehicle Repair" procedure.
COMPONENT INSPECTION
1. Check Antenna Coil
1. Ignition "OFF".
2. Disconnect Key remind connector.
3. Measure resistance between terminal 1 and 2 of the Key remind connector. (Component side)
Specification : Approx. 8.4 ohms
4. Is the measured resistance within specifications?
YES - Go to "Check BCM" as below
NO
- Substitute with a known-good Antenna Coil and check for proper operation.
- If the problem is corrected, replace Antenna Coil. And then, go to "Verification of Vehicle Repair" procedure.
2. Check BCM
1. Ignition "ON" & Engine "OFF".
2. Perform neutral mode, key teaching and password teaching/changing.
NOTE: Be sure that PIN code is prepared.
3. Is Key teaching completed?
YES
- Fault is intermittent caused by poor contact in the BCM and/or the antenna coil connector or was repaired and BCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
- Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
NO - Replace BCM and Go to "Verification of Vehicle Repair" procedure.
NOTE: Be sure that that BCM registered another car can't use.
VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and monitor CURRENT DATA to check No. of Learnt key, ECM and KEY status.
2. Select "Diagnostic Trouble Codes (DTCs)" mode and Clear the DTCs.
3. Are any DTCs present?
YES - Go to the applicable troubleshooting procedure.
NO - System is performing to specification at this time.