| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM100000001H97L |
| Model Year Start: 2020 | Model: Corolla | Prod Date Range: [01/2019 - 09/2022] |
| Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): B1498; Communication Malfunction (A/C Inverter Local); 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022] | ||
|
DTC |
B1498 |
Communication Malfunction (A/C Inverter Local) |
DESCRIPTION
The hybrid vehicle control ECU and compressor with motor assembly communicate via direct line. Compressor control is stopped and this DTC is stored if communication information is cut off or abnormal information is received.
This DTC is also detected if high-voltage electricity supplied from the inverter with converter assembly to the compressor control circuit is shut off.
This DTC will be stored as a history DTC.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Memory |
|---|---|---|---|---|
|
B1498 |
Communication Malfunction (A/C Inverter Local) |
|
|
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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- 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.
- Depending on the timing of the power supply to the 12 V power supply circuit and high-voltage circuit when the power switch is turned on (READY), an abnormal information signal may be output, causing this DTC to be stored. If the output DTC is a code that was memorized in the past, check the fuses and wire harnesses. If there is no malfunction, clear the DTC.
-
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 |
|---|---|
|
Both P058A01 and P162B87 are not output |
A |
|
P058A01 and P162B87 are output |
B |
| B |
|
|
|
2. |
CHECK HARNESS AND CONNECTOR (COMPRESSOR WITH MOTOR ASSEMBLY - IG POWER SOURCE AND BODY GROUND) |
CAUTION:
Do not disconnect the connector on the high-voltage side.
(a) Disconnect the C96 compressor with motor assembly connector.
(b) Measure the voltage and resistance according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
C96-1 (IG1) - Body ground |
Power switch on (IG) |
11 to 14 V |
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
C96-2 (GND) - Body ground |
Always |
Below 1 Ω |
NOTICE:
If the power switch is turned on (IG) with the connector disconnected, other DTCs will be stored. Be sure to clear the DTCs after the inspection.
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| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. |
CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - COMPRESSOR WITH MOTOR ASSEMBLY) |
(a) Disconnect the A57 hybrid vehicle control ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A57-8 (LIN3) - C96-3 (DOUT) |
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 and X2 HV air conditioning wire connectors.
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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 |
|
|
|
5. |
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 |
|
REPLACE COMPRESSOR WITH MOTOR ASSEMBLY
|
| NG |
|
REPLACE HV AIR CONDITIONING WIRE
|
|
6. |
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 |
|
REPLACE COMPRESSOR WITH MOTOR ASSEMBLY
|
| NG |
|
REPLACE HV AIR CONDITIONING WIRE
|
|
7. |
CHECK FOR DTC |
(a) Disconnect the C86 battery state sensor assembly connector.
(b) Connect the Techstream to the DLC3.
(c) Turn the power switch on (IG).
(d) Turn the Techstream on.
(e) Enter the following menus: Body Electrical / Air Conditioner / Trouble Codes.
(f) Check if air conditioning system DTCs are output.
Body Electrical > Air Conditioner > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
B1498 is not output |
A |
|
B1498 is output |
B |
| A |
|
|
|
8. |
CHECK FOR DTC |
(a) Connect the C86 battery state sensor assembly connector.
(b) Disconnect the C96 compressor with motor assembly connector.
(c) Connect the Techstream to the DLC3.
(d) Turn the power switch on (IG).
(e) Turn the Techstream on.
(f) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
(g) Check if hybrid control system DTCs are output.
Powertrain > Hybrid Control > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
Both P058A01 and P162B87 are not output |
A |
|
P058A01 and P162B87 are output |
B |
| A |
|
REPLACE COMPRESSOR WITH MOTOR ASSEMBLY
|
|
|
9. |
CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - COMPRESSOR WITH MOTOR ASSEMBLY AND BATTERY STATE SENSOR ASSEMBLY) |
(a) Disconnect the A57 hybrid vehicle control ECU connector.
(b) Disconnect the C86 battery state sensor assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A57-8 (LIN3) - C96-3 (DOUT) |
Always |
Below 1 Ω |
|
A57-8 (LIN3) - C86-2 (LIN) |
Always |
Below 1 Ω |
|
A57-8 (LIN3) or C96-3 (DOUT) - Other terminals and body ground |
Always |
10 kΩ or higher |
|
A57-8 (LIN3) or C86-2 (LIN) - Other terminals and body ground |
Always |
10 kΩ or higher |
| OK |
|
REPLACE HYBRID VEHICLE CONTROL ECU
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|