Code No.22 Malfunction of the Height Sensor (Front)

caution

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

TROUBLE JUDGMENT

When the headlamp automatic levelling-ECU receives an abnormal voltage signal from the front height sensor, diagnosis code No. 22 is set.

COMMENTS ON TROUBLE SYMPTOM

The front height sensor, the headlamp automatic levelling-ECU, or wiring harness and connectors between the two may be defective.

PROBABLE CAUSES

Malfunction of the front 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: D-125 Headlamp automatic levelling-ECU connector

Q. Is the check result normal?

Go to Step 4.

Repair the defective connector.

STEP 4. Check the wiring harness from A-22 front height sensor connector (terminal No. 1, 2 and 3) to D-125 headlamp automatic levelling-ECU connector (terminal No. 15, 17 and 19).

Check the power supply lines, earth lines and communication lines for open circuit.

note

Prior to the wiring harness inspection, check intermediate connector D-239, and repair if necessary.

Q. Is the check result normal?

Go to Step 5.

Repair the wiring harness.

STEP 5. Check whether the diagnosis code is reset.

Q. Is diagnosis code No. 22 set?

Replace the headlamp automatic levelling ECU.

A poor connection, open circuit, or other intermittent malfunctions between the front height sensor and the headlamp automatic levelling ECU (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions