- Harness or connector between No. 2 air conditioning control assembly and IG power source
- Harness or connector between No. 2 air conditioning control assembly and body ground
- LIN communication system
- Air conditioning control assembly
- Air conditioning amplifier
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000ZPDD |
| Model Year Start: 2017 | Model: Sienna | Prod Date Range: [08/2016 - ] |
| Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: B14B3; Lost Communication with Rear Panel LIN; 2017 - 2020 MY Sienna [08/2016 - ] | ||
|
DTC |
B14B3 |
Lost Communication with Rear Panel LIN |
DESCRIPTION
The air conditioning control assembly communicates with the air conditioning amplifier through the LIN communication system.
If the LIN communication system malfunctions, the air conditioning amplifier does not operate even if the air conditioning control assembly is operated.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B14B2 |
Lost communication with No. 2 air conditioning control assembly |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
|
1. |
CHECK HARNESS AND CONNECTOR (NO. 2 AIR CONDITIONING CONTROL ASSEMBLY - IG1 NO. 2 RELAY) |
|
*a |
Front view of wire harness connector (to Air Conditioning Amplifier) |
(a) Disconnect the air conditioning control assembly connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
T7-1 (IG) - Body ground |
Ignition switch ON |
11 to 14 V |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
2. |
CHECK HARNESS AND CONNECTOR (NO. 2 AIR CONDITIONING CONTROL ASSEMBLY - BODY GROUND) |
|
(a) Disconnect the 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 |
|---|---|---|
|
T7-4 (E) - Body ground |
Always |
Below 1 Ω |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - AIR CONDITIONING AMPLIFIER) |
(a) Disconnect the T7 No. 2 air conditioning control assembly connector.
(b) Disconnect the D186 air conditioning amplifier connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
T7-2 (RLIN) - D186-16 (RLIN) |
Always |
Below 1 Ω |
|
T7-2 (RLIN) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
REPLACE AIR CONDITIONING CONTROL ASSEMBLY |
(a) Replace the air conditioning control assembly with a new or normally functioning one (See page
![2016 - 2020 MY Sienna [12/2015 - ]; HEATING / AIR CONDITIONING: AIR CONDITIONING PANEL: REMOVAL](/t3Portal/stylegraphics/info.gif)
).
|
|
5. |
CHECK FOR DTC |
(a) Clear the DTCs (See page
).
(b) Check for DTCs (See page
).
OK:
DTC B14B2 is not output
| OK |
|
END (AIR CONDITIONING CONTROL ASSEMBLY IS FAULTY) |
| NG |
|
|
|