Inspection Procedure 4: The freeze mark does not illuminate or flash normally. The freeze warning buzzer does not sound.

CIRCUIT OPERATION

note

If the destination setting is wrong, normal operation is not possible because the threshold values of the freeze mark or freeze warning buzzer are different.

freeze warning operate

Conditions		Display control
When the air temperature is 3 °C or lower, at the ignition switch "ON" position.		The ETACS-ECU buzzer (freeze warning buzzer) sounds and the freeze mark flashes for 10 seconds.
When the air temperature that is over 3 °C at the ignition switch "ON" position changes to 3 °C or lower.
After the warnings described as above is operated.	When the air temperature that is 6 °C or higher changes to 3 °C or lower	When the air temperature reaches to 6 °C, the freeze mark disappears, and when the air temperature decreases to 3 °C or lower again, the freeze mark flashes for 10 seconds. However, the buzzer does not sound.
	When the air temperature that is over 3 °C but below 6 °C decreases to 3 °C or lower	When the air temperature is over 3 °C but below 6 °C, the freeze mark keeps displaying. If the air temperature decreases to 3 °C or lower again, the buzzer does not sound and the freeze mark does not flash again.

COMMENTS ON TROUBLE SYMPTOM

PROBABLE CAUSES

Malfunction of the RV meter
Malfunction of the ETACS-ECU
Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Check the DESTINATION in the service mode

Check that in the service mode the item "DESTINATION" is set as "G·EXP/EU/MMAL". (Refer to

Q. Is the check result satisfactory?

	Go to Step 2

	Set the "DESTINATION" again in the service mode, and recheck the trouble symptom. (Refer to .)

STEP 2. Check the RV meter.

Check that the ambient air temperature is displayed normally.

Q. Is the check result satisfactory?

	YES (The freeze mark does not illuminate or flash normally.) : Go to Step 5

	YES (The freeze warning buzzer does not sound.) : Go to Step 3

	Perform the troubleshooting, Inspection Procedure 2: "The drive information is not displayed normally". (Refer to .)

STEP 3. M.U.T.-III CAN bus diagnostics

Use the M.U.T-III to diagnose the CAN bus lines.

Q. Is the check result satisfactory?

	Go to Step 4

	Repair the CAN bus lines (Refer to GROUP 54C, Diagnosis - Can Bus Diagnostics Table ). After diagnosing the CAN bus lines, go to Step 4.

STEP 4. M.U.T-III other system diagnosis code.

Check that the ETACS-ECU does not set the diagnosis code.

Q. Is the diagnosis code set?

	Diagnose ETACS-ECU (Refer to GROUP 54B, Diagnosis - diagnosis code chart ).

	Go to Step 5

STEP 5. M.U.T.-III diagnosis code.

When the ignition switch is turned to the "LOCK" (OFF) position, check that the RV meter does not set the diagnosis code.

Q. Is the diagnosis code set?

	Refer to diagnosis code chart .

	Go to Step 6

STEP 6. Recheck for malfunction.

Q. Is a malfunction eliminated?

	If no malfunctions are found in all steps, an intermittent malfunction is suspected. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .

	Replace the RV meter.