Code No. B2516
Rear height sensor signal
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Before replacing the ECU, ensure that the power supply
circuit, the earth circuit and the communication circuit are normal.
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DIAGNOSTIC FUNCTION
If a trouble occurs in rear height sensor, headlamp automatic levelling system warnings
are displayed on the multi information display and code No. B2516 is set.
JUDGEMENT CRITERIA
The headlamp automatic levelling-ECU detects the error of the signal voltage from the
rear height sensor (less than 0.7 V, or 4.2 V or more) or 1 second or longer continuously.
PROBABLE CAUSES
- Malfunction of the rear height sensor
- Malfunction of the rear height sensor installation
- Malfunction of the headlamp automatic levelling-ECU
- Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Check if diagnosis code No. B2514 is set.
Q.
Is diagnosis code No. B2514 set?
Perform the troubleshooting of diagnosis code No. B2514.
Go to Step 2.
STEP 2. Rear height sensor installation status check
Check that the rear height sensor is installed properly.
Q.
Is the check result normal?
Go to Step 3.
Install the rear height sensor properly.
STEP 3. Voltage measurement at rear height sensor connector (SB terminal).
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(1)Disconnect the connector, and measure at the wiring harness-side connector.
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(2)Turn the ignition switch to the ON position.
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(3)Measure the resistance between the rear height sensor connector (SBR terminal)
and body earth.
OK: 5 V
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Q.
Is the check result normal?
Go to Step 5.
Go to Step 4.
STEP 4. Check of open circuit in SB line between rear height sensor
connector and headlamp automatic levelling-ECU connector.
Q.
Is the check result normal?
Go to Step 5.
Repair the connector(s) or wiring harness.
STEP 5. Resistance measurement at rear height sensor connector (SG
terminal).
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Measure the resistance between the rear height sensor connector (SG terminal) and
body earth.
OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
Go to Step 7.
Go to Step 6.
STEP 6. Check of open circuit in SG line between rear height sensor
connector and headlamp automatic levelling-ECU connector.
Q.
Is the check result normal?
Go to Step 7.
Repair the connector(s) or wiring harness.
STEP 7. Check of short to power supply, short to earth, and open circuit
in SHR line between rear height sensor connector and headlamp automatic levelling-ECU connector.
Q.
Is the check result normal?
Go to Step 8.
Repair the connector(s) or wiring harness.
STEP 8. rear height sensor check
Check that the rear height sensor is normal (Refer to 
).
Q.
Is the check result normal?
Go to Step 9.
Replace the rear height sensor (Refer to ).
STEP 9 M.U.T.-III data list
Check the rear height sensor for the signal voltage.
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Item No.
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Item name
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Normal condition
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5
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Rear height SNSR.signal voltage
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0.7 V - 4.1 V
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OK: Normal condition is displayed.
Q.
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to cope with Intermittent Malfunctions ).
Replace the headlamp automatic levelling-ECU (Refer to ).