| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM1000000026Z43 |
| Model Year Start: 2023 | Model: Corolla | Prod Date Range: [09/2022 - ] |
| Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): B149887; A/C Inverter Local Missing Message; 2023 - 2025 MY Corolla Corolla HV [09/2022 - ] | ||
|
DTC |
B149887 |
A/C Inverter Local Missing Message |
DESCRIPTION
The hybrid vehicle control ECU and compressor with motor assembly communicate via a direct line. Compressor control is stopped and this DTC is stored if communication information is cut off or abnormal information occurs.
This DTC is also detected if high-voltage power supplied from the inverter with converter assembly to the compressor control circuit is shut off.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Memory |
|---|---|---|---|---|
|
B149887 |
A/C Inverter Local Missing Message |
Diagnosis Condition:
Malfunction:
Detection Time:
|
|
Memorized |
DTC Detection Condition Combination Table
|
Vehicle Condition |
||||
|---|---|---|---|---|
|
Pattern 1 |
Pattern 2 |
Pattern 3 |
||
|
Diagnosis Condition |
Ignition switch ON (READY) |
○ |
○ |
○ |
|
Malfunction |
Error in communication line between the hybrid vehicle control ECU and compressor with motor assembly |
○ |
- |
- |
|
Open in communication line between the hybrid vehicle control ECU and compressor with motor assembly |
- |
○ |
- |
|
|
High-voltage power source shut off |
- |
- |
○ |
|
|
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:
Click here
-
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) |
(a) Check for DTCs.
Powertrain > Hybrid Control > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
P058A01 and P162B87 are not output |
A |
|
P058A01 or P162B87 is output |
B |
| B |
|
|
|
2. |
CHECK HARNESS AND CONNECTOR (COMPRESSOR WITH MOTOR ASSEMBLY - AUXILIARY BATTERY AND BODY GROUND) |
CAUTION:
Do not disconnect the connector on the high-voltage side.
NOTICE:
As other DTCs will be stored when the ignition switch is turned to ON with the connector disconnected, be sure to clear the DTCs after the inspection.
|
(a) Disconnect the C96 compressor with motor assembly connector. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
C96-1 (IG1) - Body ground |
Ignition switch ON |
11 to 14 V |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
C96-2 (GND) - Body ground |
Always |
Below 1 Ω |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. |
CHECK HARNESS AND CONNECTOR (COMPRESSOR WITH MOTOR ASSEMBLY - HYBRID VEHICLE CONTROL ECU) |
(a) Disconnect the C96 compressor with motor assembly connector.
(b) Disconnect the A161 hybrid vehicle control ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
C96-3 (DOUT) - A161-16 (LIN3) |
Always |
Below 1 Ω |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
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.
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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 |
|
|
|
5. |
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 |
|
|
6. |
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 |
|
|
7. |
CHECK FOR DTC |
(a) Disconnect the A162 battery state sensor assembly connector.
(b) Check for DTCs.
Body Electrical > Air Conditioner > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
B149887 is not output |
A |
|
B149887 is output |
B |
| A |
|
REPLACE BATTERY STATE SENSOR ASSEMBLY
|
|
|
8. |
CHECK FOR DTC (HYBRID CONTROL) |
(a) Connect the A162 battery state sensor assembly connector.
(b) Disconnect the C96 compressor with motor assembly connector.
(c) Check for DTCs.
Powertrain > Hybrid Control > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
P058A01 and P162B87 are not output |
A |
|
P058A01 or P162B87 is output |
B |
| A |
|
REPLACE COMPRESSOR WITH MOTOR ASSEMBLY
|
|
|
9. |
CHECK HARNESS AND CONNECTOR (COMPRESSOR WITH MOTOR ASSEMBLY - HYBRID VEHICLE CONTROL ECU) |
(a) Disconnect the A161 hybrid vehicle control ECU connector.
(b) Disconnect the C96 compressor with motor assembly connector.
(c) Disconnect the A162 battery state sensor assembly connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A161-16 (LIN3) - C96-3 (DOUT) |
Always |
Below 1 Ω |
|
A161-16 (LIN3) - A162-2 (LIN) |
Always |
Below 1 Ω |
|
A161-16 (LIN3) - Other terminals and body ground |
Always |
10 kΩ or higher |
|
C96-3 (DOUT) - Other terminals and body ground |
Always |
10 kΩ or higher |
|
A162-2 (LIN) - Other terminals and body ground |
Always |
10 kΩ or higher |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|