P0A84

P112 HYBRID BATTERY CONTROL: HYBRID BATTERY SYSTEM: P0A84: Hybrid Battery Pack Cooling Fan 1 Control Circuit Low

DTC P0A84 - Hybrid Battery Pack Cooling Fan 1 Control Circuit Low

DTC P0A85 - Hybrid Battery Pack Cooling Fan 1 Control Circuit High

DESCRIPTION

The blower motor controller regulates the voltage of the battery blower. The blower motor controller has fins made of aluminum. The exhaust air from the HV battery assembly that flows through the quarter vent duct cools the blower motor controller, which is installed in the quarter vent duct.
The current flows from the FCTL1 terminal of the battery ECU to the relay coil of the No. 1 battery blower relay and as the contact point of the relay closes, the power is supplied to the battery blower.
When a fan actuation signal is transmitted from the battery ECU, the blower motor controller adjusts voltage (VM) which is applied to the battery blower in order to get the requested fan speed. The adjusted voltage is also transmitted to the VM terminal of the battery ECU in the form of a monitoring signal. The blower motor controller corrects the voltage at the blower motor by monitoring voltage at the +B terminal of the battery blower.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK FUSE (BATT FAN)

(a) Remove the BATT FAN fuse from the engine room relay block.
(b) Measure the resistance of the BATT FAN fuse.
Standard resistance:
Below 1 Ohms
(c) Reinstall the BATT FAN fuse.
NG -- CHECK WIRE HARNESS (NO. 1 BATTERY BLOWER RELAY - BATT FAN FUSE)
OK -- Continue to next step.
2. INSPECT NO. 1 BATTERY BLOWER RELAY

(a) Remove the No. 1 battery blower relay.
(b) Measure the resistance of the terminals of the relay.
Standard resistance:

(c) Reinstall the No. 1 battery blower relay.
NG -- REPLACE NO. 1 BATTERY BLOWER RELAY
OK -- Continue to next step.
3. INSPECT BATTERY BLOWER

(a) Disconnect the B9 battery blower connector.
(b) Connect the positive terminal of the battery to terminal 2 of the battery blower connector, and the negative battery terminal to terminal 1 of the connector.
(c) Check that the blower fan rotates when voltage is applied.
OK:
Blower fan rotates
NG -- REPLACE BATTERY BLOWER
OK -- Continue to next step.
4. CHECK BATTERY BLOWER MOTOR CONTROLLER
(a) Check the battery blower motor controller (Testing and Inspection).
NG -- REPLACE QUARTER VENT DUCT (BATTERY BLOWER MOTOR CONTROLLER)
OK -- Continue to next step.
5. CHECK WIRE HARNESS (NO. 1 BATTERY BLOWER RELAY - BATT FAN FUSE)

(a) Remove the B14 No. 1 battery blower relay.
(b) Remove the BATT FAN fuse from the engine room relay block.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:

NOTE: When taking a measurement with a tester, do not apply excessive force to the tester probe to avoid damaging the holder.

(d) Reinstall the No. 1 battery blower relay.
(e) Reinstall the BATT FAN fuse.
NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
6. CHECK WIRE HARNESS (NO. 1 BATTERY BLOWER RELAY - BATTERY BLOWER)

(a) Remove the B14 No. 1 battery blower relay.
(b) Disconnect the B9 battery blower connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:

(a) Disconnect the B9 battery blower connector.
(b) Disconnect the B10 battery blower motor controller connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:

(d) Reconnect the battery blower connector.
(e) Reconnect the battery blower motor controller connector.
NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
8. CHECK WIRE HARNESS (BATTERY BLOWER - BATTERY ECU)

(a) Disconnect the B9 battery blower connector.
(b) Disconnect the B11 battery ECU connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:

(d) Reconnect the battery blower connector.
(e) Reconnect the battery ECU connector.
NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
9. CHECK WIRE HARNESS (BATTERY BLOWER - BATTERY BLOWER MOTOR CONTROLLER)

(d) Reconnect the battery blower connector.
(e) Reconnect the battery blower motor controller connector.
NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
10. CHECK WIRE HARNESS (NO. 1 BATTERY BLOWER RELAY - BATTERY ECU)

(a) Remove the B14 No. 1 battery blower relay.
(b) Disconnect the B11 battery ECU connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:

(a) Disconnect the B10 battery blower motor controller connector.
(b) Disconnect the B11 battery ECU connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:

(d) Reconnect the battery blower motor controller connector.
(e) Reconnect the battery ECU connector.
NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
12. CHECK WIRE HARNESS (BATTERY BLOWER MOTOR CONTROLLER - BODY GROUND)

(a) Disconnect the B10 battery blower motor controller connector.
(b) Measure the resistance of the wire harness side connector.
Standard resistance:

(c) Reconnect the battery blower motor controller connector.
NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
13. CHECK WIRE HARNESS (NO. 1 BATTERY BLOWER RELAY)

(a) Remove the B14 No. 1 battery blower relay.
(b) Measure the resistance of the wire harness side connectors.
Standard resistance:

NOTE: When taking a measurement with a tester, do not apply excessive force to the tester probe to avoid damaging the holder.

(c) Reinstall the No. 1 battery blower relay.
NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- REPLACE BATTERY ECU
14. CHECK WIRE HARNESS (NO. 1 BATTERY BLOWER RELAY - BATT FAN FUSE)

(a) Remove the B14 No. 1 battery blower relay.
(b) Remove the BATT FAN fuse from the engine room relay block.
(c) Measure the resistance of the wire harness side connector.
Standard resistance:

NOTE: When taking a measurement with a tester, do not apply excessive force to the tester probe to avoid damaging the holder.

(d) Reinstall the No. 1 battery blower relay.
(e) Reinstall the BATT FAN fuse.
NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR AND REPLACE FUSE (BATT FAN)
OK -- Continue to next step.
15. CHECK WIRE HARNESS (NO. 1 BATTERY BLOWER RELAY - BATTERY BLOWER)

(a) Remove the B14 No. 1 battery blower relay.
(b) Disconnect the B9 battery blower connector.
(c) Disconnect the B10 battery blower motor controller connector.
(d) Measure the resistance of the wire harness side connector.
Standard resistance:

NOTE: When taking a measurement with a tester, do not apply excessive force to the tester probe to avoid damaging the holder.

(e) Reinstall the No. 1 battery blower relay.
(f) Reconnect the battery blower connector.
(g) Reconnect the battery blower motor controller connector.
NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR AND REPLACE FUSE (BATT FAN)
OK -- Continue to next step.
16. CHECK WIRE HARNESS (NO. 1 BATTERY BLOWER RELAY - BATTERY ECU)

(a) Remove the B14 No. 1 battery blower relay.
(b) Disconnect the B11 battery ECU connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:

NOTE: When taking a measurement with a tester, do not apply excessive force to the tester probe to avoid damaging the holder.

(d) Reinstall the No. 1 battery blower relay.
(e) Reconnect the battery ECU connector.
NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR AND REPLACE FUSE (BATT FAN)
OK -- Continue to next step.
17. CHECK BATTERY BLOWER MOTOR CONTROLLER
(a) Check the battery blower motor controller (Testing and Inspection).
NG -- REPLACE QUARTER VENT DUCT (BATTERY BLOWER MOTOR CONTROLLER)
OK -- REPLACE BATTERY ECU