| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM100000001H97D |
| Model Year Start: 2020 | Model: Corolla | Prod Date Range: [01/2019 - 04/2020] |
| Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): B1471; A/C Inverter High Voltage Power Resource System; 2020 MY Corolla Corolla HV [01/2019 - 04/2020] | ||
|
DTC |
B1471 |
A/C Inverter High Voltage Power Resource System |
DESCRIPTION
The hybrid vehicle control ECU monitors the voltage of the HV battery. The hybrid vehicle control ECU stops compressor control and stores this DTC when the monitored voltage is outside the specified range.
This DTC will be stored as a history DTC. Compressor control may not resume unless the power switch is turned off.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Memory |
|---|---|---|---|---|
|
B1471 |
A/C Inverter High Voltage Power Resource System |
|
|
Memorized |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
CAUTION:
- Before inspecting the high-voltage system, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
- Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed.
NOTICE:
- Inspect the fuses for circuits related to this system before performing the following procedure.
-
After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.
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![2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - ]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION](/t3Portal/stylegraphics/info.gif)
- The hybrid control system and air conditioning system output DTCs separately. Perform troubleshooting for the hybrid control system first if DTCs for both systems are output simultaneously.
-
The air conditioning system uses the CAN communication system. Inspect the communication functions by following How to Proceed with Troubleshooting. Troubleshoot the air conditioning system after confirming that the communication systems are functioning properly.
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PROCEDURE
|
1. |
CHECK FOR DTC |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (READY).
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
(e) Check if hybrid control system DTCs are output.
Powertrain > Hybrid Control > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
DTCs are not output |
A |
|
DTCs are output |
B |
| B |
|
|
|
2. |
INSPECT HV AIR CONDITIONING WIRE |
CAUTION:
Be sure to wear insulated gloves.
(a) Disconnect the X1 and X2 HV air conditioning wire connectors.
HINT:
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(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
X1-2 (PB) - X2-1 (ACPB) |
Always |
Below 1 Ω |
| NG |
|
|
|
3. |
INSPECT HV AIR CONDITIONING WIRE |
CAUTION:
Be sure to wear insulated gloves.
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
X1-1 (PE) - X2-2 (ACPE) |
Always |
Below 1 Ω |
| OK |
|
| NG |
|
|
4. |
INSPECT HV AIR CONDITIONING WIRE |
CAUTION:
Be sure to wear insulated gloves.
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
X1-2 (PB) - Body ground |
Always |
10 kΩ or higher |
| OK |
|
| NG |
|
|
|