Toyota Camry (XV70): Lost Communication with Front Panel LIN (B14B2)
DESCRIPTION
The air conditioning control assembly communicates with the air conditioning amplifier assembly via LIN communication.
If a malfunction occurs in the LIN communication system, the air conditioning amplifier assembly will not operate, even if the air conditioning control assembly is operated.
|
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
Memory |
|---|---|---|---|---|
| B14B2 |
Lost Communication with Front Panel LIN |
Lost communication with air conditioning control assembly |
| Memorized (10 sec. or more)* |
- *: The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.
WIRING DIAGRAM
PROCEDURE
| 1. |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - IG POWER SOURCE) |
(a) Disconnect the K26 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 |
|---|---|---|
|
K26-2 (IG+) - Body ground |
Ignition switch ON | 11 to 14 V |
|
K26-2 (IG+) - Body ground |
Ignition switch off | Below 1 V |
| NG | .gif) | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
.gif)
| 2. |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - BODY GROUND) |
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
K26-6 (GND) - Body ground |
Always | Below 1 ? |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY) |
(a) Disconnect the K54 air conditioning amplifier assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
K26-9 (LIN1) - K54-14 (LIN1) |
Always | Below 1 ? |
|
K26-9 (LIN1) or K54-14 (LIN1) - Other terminals and body ground |
Always | 10 k? or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 4. |
INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY |
(a) Connect the K54 air conditioning amplifier assembly connector.
(b) Turn the ignition switch to ON.
(c) Using a Techstream, check the waveform.
OK:
Waveform is similar to that shown in the illustration.
|
Item | Content |
|---|---|
|
Terminal No. | K54-14 (LIN1) - Body ground |
|
Tool Setting | 2 V/DIV., 20 ms./DIV. |
|
Condition | Ignition switch ON |
| NG | | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
|
.gif)
|
| 5. |
INSPECT AIR CONDITIONING CONTROL ASSEMBLY |
(a) Connect the K26 air conditioning control assembly connector.
(b) Turn the ignition switch to ON.
(c) Using a Techstream, check the waveform.
OK:
Waveform is similar to that shown in the illustration.
|
Item | Content |
|---|---|
|
Terminal No. | K26-9 (LIN1) - Body ground |
|
Tool Setting | 2 V/DIV., 20 ms./DIV. |
|
Condition | Ignition switch ON |
| OK | | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
|
| NG | | REPLACE AIR CONDITIONING CONTROL ASSEMBLY
|
READ NEXT:
SEE MORE:
Inspection
INSPECTION PROCEDURE 1. INSPECT HEADLIGHT ASSEMBLY LH (for Bulb Type Turn Signal Light)
*a Component without harness connected
(Headlight Assembly LH) (a) Apply battery voltage to the headlight assembly LH and check that the Lo/Hi beam shade operates.
OK:
Condition
Disassembly
DISASSEMBLY CAUTION / NOTICE / HINT
NOTICE: Before installation of each part, thoroughly clean and dry it. Then apply grease or oil as necessary. Do not use alkaline chemicals to clean aluminum parts, rubber parts or precoated bolts. Also, do not use non-residue solvent or other cleaning oils to c
