Code No.21 Height Sensor Abnormality (Rear)
caution | Before replacing the ECU, ensure that the communication circuit is normal. |
TROUBLE JUDGMENT
COMMENTS ON TROUBLE SYMPTOM
PROBABLE CAUSES
- Malfunction of the rear height sensor
- Malfunction of the headlamp automatic levelling ECU
- Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
STEP 1. Connector check: D-117 rear height sensor connector
Q.
Is the check result normal?
STEP 2. Rear height sensor check
Q.
Is the check result normal?
STEP 3. Connector check: C-112 headlamp automatic levelling ECU connector
Q.
Is the check result normal?
STEP 4. Wiring harness check between the D-117 rear height sensor connector terminal No. 1/2/3 and the C-112 headlamp automatic levelling ECU connector terminal No. 16/18/20.
- Check the power supply lines, earth lines and communication lines for open circuit.
note | Before the wiring harness check, check the intermediate connectors C-131 and D-116, and then repair that if necessary. |