Code No. B2514
Height sensor supply voltage
| caution |
Before replacing the ECU, ensure that the power supply
circuit, the earth circuit and the communication circuit are normal.
|
DIAGNOSTIC FUNCTION
If a trouble occurs in height sensor, headlamp automatic levelling system warnings are
displayed on the multi information display and code No. B2514 is set.
JUDGEMENT CRITERIA
The headlamp automatic levelling-ECU detects the power supply error of the height sensor
(less than 4.2 V, or 5.8 V or more) for 1 second or longer continuously.
PROBABLE CAUSES
- Malfunction of the front height sensor
- Malfunction of the rear height sensor
- Malfunction of the headlamp automatic levelling-ECU
- Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
STEP 1. Voltage measurement at front height sensor connector
(SB terminal).
|
|
(1)Disconnect the connector, and measure at the wiring harness-side connector.
|
|
|
(2)Turn the ignition switch to the ON position.
|
|
|
(3)Measure the resistance between the front height sensor connector (SBF terminal)
and body earth.
OK: 5 V
|
Q.
Is the check result normal?
Go to Step 3.
Go to Step 2.
STEP 2. Check of short to power supply, short to earth circuit in
SB line between front height sensor connector and headlamp automatic levelling-ECU connector.
Q.
Is the check result normal?
Go to Step 3.
Repair the connector(s) or wiring harness.
STEP 3. Check whether the diagnosis code is set again.
Q.
Is diagnosis code No. B2514 set?
Go to Step 4.
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to cope with Intermittent Malfunctions 
).
STEP 4. Voltage measurement at rear height sensor connector (SB terminal).
|
|
(1)Disconnect the connector, and measure at the wiring harness-side connector.
|
|
|
(2)Turn the ignition switch to the ON position.
|
|
|
(3)Measure the resistance between the rear height sensor connector (SB terminal) and
body earth.
OK: 5 V
|
Q.
Is the check result normal?
Go to Step 6.
Go to Step 5.
STEP 5. Check of short to power supply, short to earth circuit in
SB line between rear height sensor connector and headlamp automatic levelling-ECU connector.
Q.
Is the check result normal?
Go to Step 6.
Repair the connector(s) or wiring harness.
STEP 6. Check whether the diagnosis code is set again.
Q.
Is diagnosis code No. B2514 set?
Go to Step 7.
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to cope with Intermittent Malfunctions ).
STEP 7. M.U.T.-III data list
Disconnect the front and rear height sensor connector, and check the power supply voltage
to the height sensor.
|
|
Item No.
|
Item name
|
Normal condition
|
3
|
Height sensor PWR supply voltage
|
5 V
|
|
OK: Normal condition is displayed.
Q.
Is the check result normal?
Go to Step 8.
Go to Step 11.
STEP 8. Front height sensor check
Check the front height sensor for the internal failure. Refer to .
Q.
Is the check result normal?
Go to Step 9.
Replace the front height sensor (Refer to ).
STEP 9. Check whether the diagnosis code is set again.
Q.
Is diagnosis code No. B2514 set?
Go to Step 10.
The diagnosis is complete.
STEP 10. Rear height sensor check
Check the rear height sensor for the internal failure. Refer to .
Q.
Is the check result normal?
Go to Step 11.
Replace the rear height sensor (Refer to ).
STEP 11. Check whether the diagnosis code is set again.
Q.
Is diagnosis code No. B2514 set?
Replace the headlamp automatic levelling-ECU (Refer to ).
The diagnosis is complete.