Code No. P1A47: Power Supply Of Main Battery Cooling Fan Relay Abnormal (Short Circuits To Power Supply System, Open Circuits)

TROUBLE JUDGMENT

Check Condition

Every time after the BMU is activated.

Judgement Criterion

While the main battery cooling fan relay output is turned OFF, the output status signal of the main battery cooling fan relay is turned ON (during the drive).

FAIL-SAFE AND BACKUP FUNCTION

Not available

PROBABLE CAUSES

Open circuits of main battery cooling fan relay, short circuits to power supply system or damage; poor contact of connector
The BMU is failed.

DIAGNOSIS PROCEDURE

STEP 1. Connector check: A-115X main battery cooling fan relay connector

Q. Is the check result normal?

	Go to Step 2 .

	Repair.

STEP 2. Check the main battery cooling fan relay itself.

Check the main battery cooling fan relay itself (Refer to ).

Q. Is the check result normal?

	Go to Step 3 .

	Replace the main battery cooling fan relay.

STEP 3. Perform resistance measurement at A-115X main battery cooling fan relay connector

Remove the relay, and measure at relay box side.
Resistance between terminal No. 1 and earth.

OK: Continuity (2 Ω or less)

Q. Is the check result normal?

	Go to Step 4 .

	Check intermediate connector B-122, and repair if necessary. If intermediate connector is normal, Check and repair harness between A-115X (terminal No. 1) main battery cooling fan relay connector and body earth. Check earthing line for open circuit and damage.

STEP 4. Connector check: C-107 BMU connector

Q. Is the check result normal?

	Go to Step 5 .

	Repair.

STEP 5. Check harness between A-115X (terminal No. 2) main battery cooling fan relay connector and C-107 (terminal No. 12) BMU connector.

note

Before checking harness, check intermediate connector B-01, and repair if necessary.

Check output line for open circuit and damage.

Q. Is the check result normal?

	Go to Step 6 .

	Repair.

STEP 6. Perform voltage measurement at C-107 BMU connector

Measure BMU terminal voltage.
Disconnect A-115X main battery cooling fan relay.
Electric motor switch: ON
Voltage between terminal No. 12 and earth.

OK: 0 - 0.1 V

Q. Is the check result normal?

	Go to Step 7 .

	Check intermediate connector B-01, and repair if necessary. If intermediate connector is normal, check and repair harness between A-115X (terminal No. 2) main battery cooling fan relay connector and C-107 (terminal No. 12) BMU connector. Check output line for short circuit to power supply.

STEP 7. M.U.T.-III diagnosis code.

Q. Is the diagnosis code set?

	Replace the BMU.

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).