Inspection Procedure
4: Audio illuminations does not work normally.
caution
Before replacing the radio
and CD player, ensure that the power supply circuit, the earth circuit and the communication
circuit are normal.
COMMENTS ON TROUBLE SYMPTOM
If the tail lamps illuminate, illumination signal is sent from the ETACS-ECU to the radio
and CD player. This switches the illumination of the radio and CD player from day mode to night
mode. If the mode is switched, the illumination signal line, the ETACS-ECU or the radio/CD
player may be defective.
PROBABLE CAUSES
Malfunction of ETACS-ECU
Malfunction of radio and CD player
Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
STEP 1. Check that the tail lamps illuminate.
Q.
Is the check result normal?
Go to Step 2.
Diagnose the tail lamps. (Refer to .)
STEP 2. Check of short to power supply, short to earth, and open circuit
in ILL+
line between radio and CD player connector and ETACS-ECU (tail lamp relay)
Q.
Is the check result normal?
Go to Step 3.
Repair the connector(s) or wiring harness.
STEP 3. Combination meter check
When the tail lamps are activated, check that the combination meter switches from day
mode to night mode.
Q.
Is the check result normal?
Go to Step 4.
Replace the ETACS-ECU.
STEP 4. Substitute the ETACS-ECU with good one, and check the trouble
symptom.
Substitute the ETACS-ECU with good one. When the tail lamps illuminate, check that the
illumination of the radio and CD player is switched from day mode to night mode.