CODE No. C2328 Radar PWR.supply VOLT.(Below 9V)


caution Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.

OPERATION


BSW-ECU (slave) power supply is provided from the battery via ETACS-ECU.

CHECK CONDITION


Ignition switch is in the ON position.

DIAGNOSTIC FUNCTION AND JUDGEMENT CRITERIA


When system voltage remains less than 9 V, the BSW-ECU (slave) will set diagnosis code No.C2328.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE


STEP 1. Check the battery.


Refer to Battery Test.

Q. Is the check result normal?

Go to Step 2.

Charge or replace the battery.

STEP 2. Resistance measurement at BSW-ECU (slave) connector terminal GND.


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the resistance between the BSW-ECU (slave) connector terminal GND and body earth.
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?

Go to Step 3.

Repair the connector(s) or wiring harness.

STEP 3. Voltage measurement at BSW-ECU (slave) connector terminal IG.


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
(3)Check the voltage between the BSW-ECU (slave) connector terminal IG and body earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 4.

Repair the connector(s) or wiring harness.

STEP 4. Check whether the diagnosis code is set again.


Check again if the diagnosis code is set in the BSW-ECU (slave).
(1)Erase the diagnosis code.
(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

Replace the BSW-ECU (slave).

Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to cope with Intermittent Malfunction).