Code No.U1504 RLS LIN timeout/Not equipped
caution |
Before replacing the ECU, ensure that the communication circuit is normal.
|
JUDGEMENT CRITERIA
The ETACS-ECU will set diagnosis code No. U1504 when no signals are received from the lighting control sensor.
PROBABLE CAUSES
- Faulty lighting control sensor
- Malfunction of the LIN bus
|
STEP 1. Resistance measurement at the lighting control sensor connector
|
|
(1)Disconnect the connector, and measure at the wiring harness side.
|
|
(2)Measure the resistance between the lighting control sensor connector (earth terminal) and the body earth. OK: Continuity exists (2 Ω or less)
|
|
Q.
Is the check result normal?
|
|
Go to Step 3.
|
|
|
|
Go to Step 2.
|
|
|
|
STEP 2. Check of open circuit in earth line between lighting control sensor connector and body earth
|
|
Q.
Is the check result normal?
|
|
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
|
|
|
|
Repair the connector(s) or wiring harness.
|
|
|
|
STEP 3. Voltage measurement at the lighting control sensor connector.
|
|
(1)Disconnect the connector, and measure at the wiring harness side.
|
|
(2)Measure the voltage between the lighting control sensor connector (power supply terminal) and the body earth. OK: System voltage
|
|
Q.
Is the check result normal?
|
|
Go to Step 5.
|
|
|
|
Go to Step 4.
|
|
|
|
STEP 4. Check of short to power supply, and open circuit in power supply line between lighting control sensor connector and junction block connector.
|
|
Q.
Is the check result normal?
|
|
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
|
|
|
|
Repair the connector(s) or wiring harness.
|
|
|
|
STEP 5. Check of open circuit in LIN line between ETACS-ECU connector and lighting control sensor connector.
|
|
Q.
Is the check result normal?
|
|
Go to Step 6.
|
|
|
|
Repair the connector(s) or wiring harness.
|
|
|
|
STEP 6. Check whether the diagnosis code is set again.
|
|
Check again if the diagnosis code is set in the ETACS-ECU.
|
|
(1)Erase the diagnosis code.
|
|
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
|
|
(3)Check if diagnosis code is set.
|
|
Q.
Is the diagnosis code set?
|
|
Replace the lighting control sensor (Refer to GROUP 51 - Lighting Control Sensor ).
|
|
|
|
A poor connection, open circuit, or other intermittent malfunctions in the LIN bus lines between the lighting control sensor and the ETACS-ECU (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
|
|
|