P0A85
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 BATTERY BLOWER
(a) Disconnect the B9 battery blower connector.
(b) Turn the power switch ON (IG).
(c) Measure the voltage of the wire harness side connectors.
Standard voltage:
NG -- CHECK FUSE (BATT FAN)
OK -- Continue to next step.
2. 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.
3. CHECK WIRE HARNESS (BATTERY BLOWER - BATTERY BLOWER MOTOR CONTROLLER)
(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 OR CONNECTOR
OK -- Continue to next step.
4. 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 OR CONNECTOR
OK -- Continue to next step.
5. CHECK WIRE HARNESS (BATTERY BLOWER - BATTERY BLOWER MOTOR CONTROLLER)
(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 OR CONNECTOR
OK -- Continue to next step.
6. CHECK WIRE HARNESS (BATTERY BLOWER MOTOR CONTROLLER - BATTERY ECU)
(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 OR CONNECTOR
OK -- Continue to next step.
7. 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 OR CONNECTOR
OK -- Continue to next step.
8. PERFORM ACTIVE TEST USING TECHSTREAM (COOLING FAN SPD)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch ON (IG).
(c) Turn the tester ON.
(d) Enter the following menus: Powertrain / Hybrid Control / Active Test.
(e) Perform the cooling fan spd "mode 1".
(f) Connect an oscilloscope between the battery ECU terminals specified in the table below, and measure the waveform.
Waveform 3 (Battery blower motor actuation signal):
HINT: Amplitude A and B in the diagram vary by mode.
Result:
C -- REPLACE BATTERY ECU
B -- CHECK BATTERY ECU (SI TERMINAL)
A -- Continue to next step.
9. PERFORM ACTIVE TEST USING TECHSTREAM (COOLING FAN SPD)
(a) Enter the following menus: Powertrain / Hybrid Control / Active Test / Cooling Fan SPD (mode 1), Cooling Fan SPD (mode 6).
(b) Enter the following menus: All Data / VMF Fan Voltage.
(c) Perform the cooling fan spd "mode 1" or "mode 6" active test.
(d) Read the VMF Fan Voltage values.
Standard voltage:
(e) Measure the voltage between the terminals of the battery ECU while performing Cooling Fan SPD (mode 1) or Cooling Fan SPD (mode 6).
Standard voltage:
Result:
C -- REPLACE QUARTER VENT DUCT (BATTERY BLOWER MOTOR CONTROLLER)
B -- REPLACE BATTERY ECU
A -- REPLACE NO. 1 BATTERY BLOWER RELAY
10. 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.
11. 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.
12. 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 OR CONNECTOR
OK -- Continue to next step.
13. 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:
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 blower connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
14. 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 OR CONNECTOR
OK -- REPLACE NO. 1 BATTERY BLOWER RELAY
15. CHECK BATTERY ECU (SI TERMINAL)
(a) Disconnect the B10 battery blower motor controller connector.
(b) Measure the resistance of the battery ECU terminals.
Standard resistance:
NG -- REPLACE BATTERY ECU
OK -- REPLACE QUARTER VENT DUCT (BATTERY BLOWER MOTOR CONTROLLER)
16. 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 OR CONNECTOR AND REPLACE FUSE (BATT FAN)
OK -- Continue to next step.
17. 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 OR CONNECTOR AND REPLACE FUSE (BATT FAN)
OK -- Continue to next step.
18. 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 OR CONNECTOR AND REPLACE FUSE (BATT FAN)
OK -- Continue to next step.
19. INSPECT BATTERY BLOWER
(a) Check the battery blower Testing and Inspection
NG -- REPLACE BATTERY BLOWER
OK -- REPLACE QUARTER VENT DUCT (BATTERY BLOWER MOTOR CONTROLLER)