| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM1000000026Z44 |
| Model Year Start: 2023 | Model: Corolla | Prod Date Range: [09/2022 - ] |
| Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): B14B287; Lost Communication with Front Panel LIN Missing Message; 2023 - 2025 MY Corolla Corolla HV [09/2022 - ] | ||
|
DTC |
B14B287 |
Lost Communication with Front Panel LIN Missing Message |
DESCRIPTION
The air conditioning control assembly communicates with the air conditioning amplifier assembly via LIN communication.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Memory |
|---|---|---|---|---|
|
B14B287 |
Lost Communication with Front Panel LIN Missing Message |
Diagnosis Condition:
Malfunction:
Detection Time:
|
|
Memorized |
DTC Detection Condition Combination Table
|
Vehicle Condition |
|||
|---|---|---|---|
|
Pattern 1 |
Pattern 2 |
||
|
Diagnosis Condition |
Ignition switch ON |
○ |
○ |
|
Malfunction |
Error in communication line between air conditioning amplifier assembly and air conditioning control assembly |
○ |
- |
|
Open in communication line between air conditioning amplifier assembly and air conditioning control assembly |
- |
○ |
|
|
Detection Time |
Continuously for 10 seconds or more |
Continuously for 10 seconds or more |
|
|
Trip Count |
1 trip |
1 trip |
|
HINT:
If the conditions of either of these patterns are detected, a DTC will be stored.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
|
1. |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - AUXILIARY BATTERY) |
(a) Disconnect the I37 air conditioning control assembly connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I37-9 (IG+) - Body ground |
Ignition switch ON |
11 to 14 V |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
2. |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - BODY GROUND) |
(a) Disconnect the I37 air conditioning control assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I37-13 (GND) - Body ground |
Always |
Below 1 Ω |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - AIR CONDITIONING CONTROL ASSEMBLY) |
(a) Disconnect the I37 air conditioning control assembly connector.
(b) Disconnect the I49 air conditioning amplifier assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I37-7 (LIN1) - I49-7 (LIN1) |
Always |
Below 1 Ω |
|
I37-7 (LIN1) or I49-7 (LIN1) - Other terminals and body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (OUTPUT) |
(a) Disconnect the I37 air conditioning control assembly connector.
(b) Connect the I49 air conditioning amplifier assembly connector.
|
(c) Using an oscilloscope, check the waveform.
OK: The waveform displays properly. |
|
| NG |
|
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
|
![2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; HEATING / AIR CONDITIONING: AIR CONDITIONING AMPLIFIER: REMOVAL](/t3Portal/stylegraphics/info.gif)
|
|
5. |
CHECK AIR CONDITIONING CONTROL ASSEMBLY (OUTPUT) |
(a) Connect the I37 air conditioning control assembly connector.
|
(b) Using an oscilloscope, check the waveform.
OK: The waveform displays properly. |
|
| OK |
|
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
|
| NG |
|
|
|