Code No. 24 Pitch Angle Abnormality

caution

Whenever the ECU is replaced, ensure that the communication circuit is normal.

TROUBLE JUDGMENT

The headlamp automatic levelling-ECU receives a vehicle height signal from the front and rear height sensors and calculates the headlamp levelling pitch angle. If an abnormal pitch angle is calculated, diagnosis code No.24 is set.

COMMENTS ON TROUBLE SYMPTOM

The front height sensor, the rear height sensor or the headlamp automatic levelling-ECU may be defective.

PROBABLE CAUSES

Malfunction of the front height sensor
Malfunction of the rear height sensor
Malfunction of the headlamp automatic levelling-ECU
Damaged wiring harness and connectors

DIAGNOSIS PROCEDURE

STEP 1. Connector check: A-22 Front height sensor connector

Q. Is the check result normal?

	Go to Step 2.

	Repair the defective connector.

STEP 2. Check the front height sensor.

Check that the front height sensor works normally (Refer to

Q. Is the check result normal?

	Go to Step 3.

	Replace the front height sensor.

STEP 3. Connector check: E-117 Rear height sensor connector

Q. Is the check result normal?

	Go to Step 4.

	Repair the defective connector.

STEP 4. Check the rear height sensor.

Check that the rear height sensor works normally (Refer to

Q. Is the check result normal?

	Go to Step 5.

	Replace the rear height sensor.

STEP 5. Connector check: D-125 Headlamp automatic levelling-ECU connector

Q. Is the check result normal?

	Go to Step 6.

	Repair the defective connector.

STEP 6. Check whether the diagnosis code is reset.

Q. Is diagnosis code No. 24 set?

	Replace the headlamp automatic levelling-ECU.

	Intermittent malfunction. (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions .)