| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM1000000026Z3Z |
| Model Year Start: 2023 | Model: Corolla | Prod Date Range: [09/2022 - ] |
| Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): B14711C; A/C Inverter High Voltage Power Resource Circuit Voltage Out of Range; 2023 - 2025 MY Corolla Corolla HV [09/2022 - ] | ||
|
DTC |
B14711C |
A/C Inverter High Voltage Power Resource Circuit Voltage Out of Range |
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 ignition switch is turned off.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Memory |
|---|---|---|---|---|
|
B14711C |
A/C Inverter High Voltage Power Resource Circuit Voltage Out of Range |
Diagnosis Condition:
Malfunction:
Detection Time:
|
|
Memorized |
DTC Detection Condition Combination Table
|
Vehicle Condition |
||||
|---|---|---|---|---|
|
Pattern 1 |
Pattern 2 |
Pattern 3 |
||
|
Diagnosis Condition |
Ignition switch ON |
○ |
○ |
○ |
|
Malfunction |
Open in A/C inverter high voltage power resource system |
○ |
- |
- |
|
Short in A/C inverter high voltage power resource system |
- |
○ |
- |
|
|
Voltage booster system damage or malfunction |
- |
- |
○ |
|
|
Detection Time |
- |
- |
- |
|
|
Trip Count |
1 trip |
1 trip |
1 trip |
|
HINT:
If the conditions of either of these patterns are detected, a DTC will be stored.
WIRING DIAGRAM
for 2WD:
for 4WD:
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.
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![2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - ]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION](/t3Portal/stylegraphics/info.gif)
-
Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed.
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NOTICE:
-
After turning the ignition 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.
-
Before disconnecting battery:
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-
Automatic learning chart:
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-
Before disconnecting battery:
- Inspect the fuses for circuits related to this system before performing the following procedure.
-
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.
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-
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 (HYBRID CONTROL SYSTEM) |
(a) Check for DTCs.
Powertrain > Hybrid Control > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
Hybrid control system DTCs are not output. |
A |
|
Hybrid control system DTCs are output. |
B |
| B |
|
|
|
2. |
INSPECT HV AIR CONDITIONING WIRE |
CAUTION:
Be sure to wear insulated gloves.
(a) Disconnect the X1 compressor with motor assembly connector.
(b) Remove the HV air conditioning wire from the inverter with converter assembly.
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NOTICE:
Make sure that no foreign matter, water, etc., enters the inverter with converter assembly.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance (for 2WD):
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
X1-2 (PB) - X3-1 (ACPB) |
Always |
Below 1 Ω |
Standard Resistance (for 4WD):
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
X1-2 (PB) - X4-1 (ACPB) |
Always |
Below 1 Ω |
| NG |
|
|
|
3. |
INSPECT HV AIR CONDITIONING WIRE |
CAUTION:
Be sure to wear insulated gloves.
(a) Disconnect the X1 compressor with motor assembly connector.
(b) Remove the HV air conditioning wire from the inverter with converter assembly.
Click here
NOTICE:
Make sure that no foreign matter, water, etc., enters the inverter with converter assembly.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance (for 2WD):
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
X1-1 (PE) - X3-2 (ACPE) |
Always |
Below 1 Ω |
Standard Resistance (for 4WD):
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
X1-1 (PE) - X4-2 (ACPE) |
Always |
Below 1 Ω |
| OK |
|
REPLACE COMPRESSOR WITH MOTOR ASSEMBLY
|
| NG |
|
|
4. |
INSPECT HV AIR CONDITIONING WIRE |
CAUTION:
Be sure to wear insulated gloves.
(a) Disconnect the X1 compressor with motor assembly connector.
(b) Remove the HV air conditioning wire from the inverter with converter assembly.
Click here
NOTICE:
Make sure that no foreign matter, water, etc., enters the inverter with converter assembly.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
X1-2 (PB) - Other terminals and body ground |
Always |
10 kΩ or higher |
| OK |
|
REPLACE COMPRESSOR WITH MOTOR ASSEMBLY AND HV AIR CONDITIONING WIRE Compressor with motor assembly:
HV air conditioning wire:
|
| NG |
|
|
|