DESCRIPTION
There may be an open circuit in the CAN bus main wire and/or the DLC3 branch wire when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 70 Ω or higher.
Symptom |
Trouble Area |
---|---|
Resistance between terminals 6 (CANH) and 14 (CANL) of DLC3 is 70 Ω or higher. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
HINT:
PROCEDURE
1. |
CHECK FOR OPEN IN CAN BUS WIRE (DLC3 BRANCH WIRE) |
(a) Turn the ignition switch off.
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
NOTICE: When the measured value is 133 Ω or higher and a CAN communication system
DTC is output, there may be a fault besides disconnection of the DLC3 branch
wire. For that reason, troubleshooting should be performed again from How
to Proceed with Troubleshooting after repairing the trouble area (See page
|
|
NG | ![]() |
REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3 |
|
2. |
CHECK FOR OPEN IN CAN BUS WIRE (ECM) |
(a) for 1AR-FE engine:
(1) Disconnect the ECM connector (A49). Text in Illustration
|
|
(2) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
A49-13 (CANH) - A49-5 (CANL) |
Ignition switch off |
108 to 132 Ω |
(b) for 2GR-FE engine:
(1) Disconnect the ECM connector (A41). Text in Illustration
|
|
(2) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
A41-10 (CANH) - A41-11 (CANL) |
Ignition switch off |
108 to 132 Ω |
Result |
Proceed to |
---|---|
OK (for 1AR-FE engine) |
A |
OK (for 2GR-FE engine) |
B |
NG |
C |
A | ![]() |
REPLACE ECM |
B | ![]() |
REPLACE ECM |
|
3. |
CHECK FOR OPEN IN CAN BUS WIRE (COMBINATION METER) |
(a) Reconnect the ECM connector.
(b) Disconnect the combination meter connector (E1). Text in Illustration
|
|
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
E1-1 (CANH) - E1-9 (CANL) |
Ignition switch off |
108 to 132 Ω |
OK | ![]() |
REPLACE COMBINATION METER |
|
4. |
CHECK FOR OPEN IN CAN BUS WIRE (CAN NO. 1 JUNCTION CONNECTOR - ECM) |
(a) Reconnect the combination meter connector.
(b) Disconnect the CAN No. 1 junction connector (A44). Text in Illustration
|
|
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
A44-4 (CANH) - A44-15 (CANL) |
Ignition switch off |
108 to 132 Ω |
NG | ![]() |
REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 1 J/C - ECM) |
|
5. |
CHECK FOR OPEN IN CAN BUS WIRE (CAN NO. 1 JUNCTION CONNECTOR - CAN NO. 2 JUNCTION CONNECTOR) |
(a) Reconnect the CAN No. 1 junction connector (A44).
(b) Disconnect the CAN No. 1 junction connector (D56). Text in Illustration
|
|
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
D56-9 (CANH) - D56-20 (CANL) |
Ignition switch off |
108 to 132 Ω |
OK | ![]() |
REPLACE CAN NO. 1 JUNCTION CONNECTOR |
|
6. |
CHECK FOR OPEN IN CAN BUS WIRE (CAN NO. 2 JUNCTION CONNECTOR) |
(a) Reconnect the CAN No. 1 junction connector (D56).
(b) Disconnect the CAN No. 2 junction connector. Text in Illustration
|
|
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Switch Condition |
Specified Condition |
Connect to |
---|---|---|---|
D68-8 (CANH) - D68-19 (CANL) |
Ignition switch off |
108 to 132 Ω |
Combination meter |
D68-9 (CANH) - D68-20 (CANL) |
Ignition switch off |
108 to 132 Ω |
CAN No. 1 junction connector |
Result |
Proceed to |
---|---|
OK |
A |
NG (to Combination meter main wire) |
B |
NG (to CAN No. 1 junction connector) |
C |
A | ![]() |
REPLACE CAN NO. 2 JUNCTION CONNECTOR |
B | ![]() |
REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 1 JUNCTION CONNECTOR - COMBINATION METER) |
C | ![]() |
REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 1 JUNCTION CONNECTOR - CAN NO. 2 JUNCTION CONNECTOR) |
Automatic High Beam Mirror (B124A)
DESCRIPTION
The DTC is stored when the main body ECU (driver side junction block assembly)
detects malfunctions in the inner rear view mirror assembly.
DTC No.
DTC Detection Condition
Trouble Area
B124A
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