| Last Modified: 01-30-2024 | 6.11:8.1.0 | Doc ID: RM100000001QM7M |
| Model Year Start: 2021 | Model: RAV4 | Prod Date Range: [08/2020 - ] |
| Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model): B1497; Communication Malfunction (Bus Ic); 2021 - 2024 MY RAV4 [08/2020 - ] | ||
|
DTC |
B1497 |
Communication Malfunction (Bus Ic) |
DESCRIPTION
The air conditioning harness assembly connects the air conditioning amplifier assembly and the servo motors. The air conditioning amplifier assembly supplies power and sends operation instructions to each servo motor through the air conditioning harness assembly. Each servo motor sends damper position information to the air conditioning amplifier assembly.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Memory |
|---|---|---|---|---|
|
B1497 |
Communication Malfunction (Bus Ic) |
|
|
Memorized |
WIRING DIAGRAM
PROCEDURE
|
1. |
PERFORM ACTIVE TEST USING TECHSTREAM (SERVO PULSE) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.
(e) Check the operation by referring to the table below.
Body Electrical > Air Conditioner > Active Test
|
Tester Display |
Measurement Item |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
Air Mix Servo Targ Pulse(D) |
for Automatic Air Conditioning System:
for Manual Air Conditioning System:
|
Min.: 128 Max.: 383 |
Operates between 165 to 257 pulses |
|
Air Mix Servo Targ Pulse(P) |
No. 1 air conditioning radiator damper servo sub-assembly (front passenger side air mix) pulse |
Min.: 128 Max.: 383 |
Operates between 255 to 347 pulses (for Automatic Air Conditioning System) |
|
Air Outlet Servo Pulse (D) |
No. 1 air conditioning radiator damper servo sub-assembly (driver side mode) pulse |
Min.: 128 Max.: 383 |
Operates between 234 to 348 pulses |
|
Air Inlet Damper Targ Pulse |
No. 1 blower damper servo sub-assembly pulse |
Min.: 128 Max.: 383 |
Operates between 220 to 256 pulses |
|
A/O Servo Pulse(Rr D) |
No. 2 air conditioning radiator damper servo sub-assembly (rear mode) pulse |
Min.: 128 Max.: 383 |
Operates between 158 to 260 pulses |
Body Electrical > Air Conditioner > Active Test
|
Tester Display |
|---|
|
Air Mix Servo Targ Pulse(D) |
Body Electrical > Air Conditioner > Active Test
|
Tester Display |
|---|
|
Air Mix Servo Targ Pulse(P) |
Body Electrical > Air Conditioner > Active Test
|
Tester Display |
|---|
|
Air Outlet Servo Pulse (D) |
Body Electrical > Air Conditioner > Active Test
|
Tester Display |
|---|
|
Air Inlet Damper Targ Pulse |
Body Electrical > Air Conditioner > Active Test
|
Tester Display |
|---|
|
A/O Servo Pulse(Rr D) |
OK:
Damper servo motor is operated.
(f) Check the operation by referring to the table below.
Result |
Proceed to |
|---|---|
|
All damper servo motors are not operated |
A |
|
Any damper servo motor is not operated |
B |
|
All damper servo motors are operated |
C |
| B |
|
| C |
|
|
|
2. |
CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (POWER SOURCE CIRCUIT) |
|
(a) Disconnect the 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 |
|---|---|---|
|
2 (BUS G) - Body ground |
Always |
Below 1 Ω |
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
2 (BUS G) - 4 (B BUS) |
Always |
11 to 14 V |
(d) Using an oscilloscope, check the waveform.
|
Item |
Content |
|---|---|
|
Tester Connection |
2 (BUS G) - 3 (BUS) |
|
Tool Setting |
2 V/DIV., 20 μs/DIV. |
|
Condition |
Ignition switch ON |
OK:
The waveform displays properly.
| OK |
|
| NG |
|
|
|