DESCRIPTION
Under normal operation, the front wiper motor and link assembly (wiper ECU) receives operation signals from the windshield wiper switch assembly via LIN communication.
The windshield front wiper motor and link assembly (wiper ECU) and windshield wiper switch assembly are also connected via direct line in order to operate the front wipers in HI in an emergency. If the operation signals sent via LIN communication and direct line do not match, this DTC is stored.
DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Memory | DTC Output from |
---|---|---|---|---|---|
B1372 | Wiper Switch Signal Mismatch between LIN and Line | When the battery voltage is 9.5 V or more, the operation signals sent via LIN communication and direct line do not match for 10 seconds or more. |
| ○ | Front wiper motor and link assembly (wiper ECU) |
WIRING DIAGRAM
PROCEDURE
1. | READ VALUE USING TECHSTREAM |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Wiper / Data List.
(e) Read the Data List according to the display on the Techstream.
Body Electrical > Wiper > Data List Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
---|---|---|---|---|
Wiper Switch LO | Front wiper control switch LO position signal | ON or OFF | ON: Front wiper control switch in LO position OFF: Front wiper control switch not in LO position | - |
Wiper Switch HI | Front wiper control switch HI position signal | ON or OFF | ON: Front wiper control switch in HI position OFF: Front wiper control switch not in HI position | - |
Wiper Switch AUTO | Front wiper control switch AUTO position signal*1 | ON or OFF | ON: Front wiper control switch in AUTO position OFF: Front wiper control switch not in AUTO position | The AUTO position of the front wiper control switch can be changed between AUTO and INT operation using a customize setting |
Wiper Switch MIST | Front wiper control switch MIST position signal | ON or OFF | ON: Front wiper control switch in MIST position OFF: Front wiper control switch not in MIST position | - |
Wiper Switch INT | Front wiper control switch INT position signal*2 | ON or OFF | ON: Front wiper control switch in INT position OFF: Front wiper control switch not in INT position | - |
Wiper Switch HI (Line) | Front wiper control switch HI position signal | ON or OFF | ON: Front wiper control switch in HI position OFF: Front wiper control switch not in HI position | - |
Tester Display |
---|
Wiper Switch LO |
Wiper Switch HI |
Wiper Switch AUTO |
Wiper Switch MIST |
Wiper Switch INT |
Wiper Switch HI (Line) |
Result | Proceed to |
---|---|
Data List item "Wiper Switch HI (Line)" only is always ON. | A |
Data List item "Wiper Switch HI (Line)" only is always OFF. | |
Data List item "Wiper Switch HI (Line)" changes correctly according to the wiper switch operation, but other Data List items do not change correctly. | B |
All of the Data List items change according to the wiper switch operation. | C |
B | GO TO STEP 4 |
C | USE SIMULATION METHOD TO CHECK |
|
2. | CHECK HARNESS AND CONNECTOR (FRONT WIPER MOTOR AND LINK ASSEMBLY - WINDSHIELD WIPER SWITCH ASSEMBLY) |
(a) Disconnect the J31 windshield wiper switch assembly connector.
(b) Disconnect the i1 front wiper motor and link assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
J31-9 (2S) - i1-1 (2S) | Always | Below 1 Ω |
J31-9 (2S) or i1-1 (2S) - Body ground | Always | 10 kΩ Higher |
OK | GO TO STEP 5 |
|
3. | CHECK WIPER MOTOR WIRE |
(a) Remove the wiper motor wire.
Click here
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
OK | REPAIR OR REPLACE HARNESS OR CONNECTOR |
NG | REPLACE WIPER MOTOR WIRE |
4. | CHECK HARNESS AND CONNECTOR (FRONT WIPER MOTOR AND LINK ASSEMBLY - WINDSHIELD WIPER SWITCH ASSEMBLY) |
(a) Disconnect the J31 windshield wiper switch assembly connector.
(b) Disconnect the i1 front wiper motor and link assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
J31-7 (MPX1) - i1-2 (MPX1) | Always | Below 1 Ω |
J31-7 (MPX1) or i1-2 (MPX1) - Body ground | Always | 10 kΩ Higher |
NG | GO TO STEP 6 |
|
5. | REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY |
(a) Replace the windshield wiper switch assembly with a new or known good one.
Click here
(b) Turn the engine switch on (IG).
(c) Check for DTCs.
Click here
Body Electrical > Wiper > Trouble Codes Result | Proceed to |
---|---|
DTC B1372 is not output. | A |
DTC B1372 is output. | B |
A | END |
B | REPLACE FRONT WIPER MOTOR AND LINK ASSEMBLY |
6. | CHECK WIPER MOTOR WIRE |
(a) Remove the wiper motor wire.
Click here
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
OK | REPAIR OR REPLACE HARNESS OR CONNECTOR |
NG | REPLACE WIPER MOTOR WIRE |
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