DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (MULTI-MEDIA MODULE RECEIVER ASSEMBLY)
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (MULTI-MEDIA MODULE RECEIVER ASSEMBLY CAN BRANCH WIRE)
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (CENTER AIRBAG SENSOR ASSEMBLY)
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (CENTER AIRBAG SENSOR ASSEMBLY CAN BRANCH WIRE)
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (AIR CONDITIONING AMPLIFIER ASSEMBLY)
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (AIR CONDITIONING AMPLIFIER ASSEMBLY CAN BRANCH WIRE)
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (HEADLIGHT SWIVEL ECU ASSEMBLY)
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (HEADLIGHT SWIVEL ECU ASSEMBLY CAN BRANCH WIRE)
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (MAIN BODY ECU)
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (MAIN BODY ECU CAN BRANCH WIRE)
SYSTEM CHECK
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (NETWORK GATEWAY ECU CAN BRANCH WIRE)
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (CLEARANCE WARNING ECU ASSEMBLY)
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (CLEARANCE WARNING ECU ASSEMBLY CAN BRANCH WIRE)
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (4WD CONTROL ECU)
CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (4WD CONTROL ECU CAN BRANCH WIRE)
CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (SKID CONTROL ECU)
CAN COMMUNICATION SYSTEM (for LHD) - Open in One Side of CAN Branch Line
DESCRIPTION
If 2 or more ECUs and/or sensors do not appear on the intelligent tester "Bus Check" screen, one side of the CAN branch wire may be open (One side of the CANH [branch wire]/CANL [branch wire] of the ECU and/or sensor is open).
| Symptom | Trouble Area |
| 2 or more ECUs and/or sensors do not appear on the intelligent tester "Bus Check" screen. | One side of CAN branch wire is open
Center airbag sensor assembly*1
Headlight swivel ECU assembly*2
Multi-media module receiver assembly*3
Air conditioning amplifier assembly
Main body ECU (cowl side junction block LH)
Network gateway ECU*4
4WD control ECU*5
Clearance warning ECU assembly*5, *6
Master cylinder solenoid (skid control ECU)*5
|
*1: w/ Airbag System
*2: w/ Dynamic Headlight Auto Leveling
*3: w/ Navigation System
*4: w/ Network Gateway ECU
*5: w/o Network Gateway ECU
*6: w/ TOYOTA Parking Assist-sensor System and w/o Side Monitor System
WIRING DIAGRAM
INSPECTION PROCEDURE
- After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work ().
Perform the following inspection for the ECUs (sensors) which are displayed on the intelligent tester. If a malfunction cannot be identified, perform the following inspections for the ECUs (sensors) connected to the CAN communication system.
Do not remove the combination meter assembly and ECM as they are the end parts of the circuit. If removed, CAN communication will not be possible.
The open circuit confirmation of the combination meter assembly, ECM and CAN main wire is performed in the Check CAN Bus Line procedure of "How to Proceed with Troubleshooting". This inspection only has procedures for checking for an open circuit on one side of a CAN branch wire.
| 1.CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (MULTI-MEDIA MODULE RECEIVER ASSEMBLY) |
- For vehicles without a navigation system, go to "Check for Open in One Side of CAN Branch Wire (Center Airbag Sensor Assembly)".
Disconnect the F77 multi-media module receiver assembly connector.
Select "Bus Check" on the intelligent tester ().
Result| Result | Proceed to |
| "Display and Navigation (AVN)" is not displayed on the intelligent tester | A |
| Several ECUs and sensors in addition to "Display and Navigation (AVN)" are displayed on the intelligent tester | B |
| 2.CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (MULTI-MEDIA MODULE RECEIVER ASSEMBLY CAN BRANCH WIRE) |
Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.
- For vehicles with an SRS system:
- Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
- When disconnecting the cable, some systems need to be initialized after the cable is reconnected ().
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Switch Condition | Specified Condition |
| F77-1 (CANH) - F77-2 (CANL) | Ignition switch off | 54 to 69 Ω |
Text in Illustration| *a | Front view of wire harness connector
(to Multi-media Module Receiver Assembly) |
| | REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY) |
|
|
| OK | |
| |
| REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY ()
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|
| 3.CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (CENTER AIRBAG SENSOR ASSEMBLY) |
- For vehicles without an airbag system, go to "Check for Open in One Side of CAN Branch Wire (Air Conditioning Amplifier Assembly)".
Disconnect the E47 center airbag sensor assembly connector.
Select "Bus Check" on the intelligent tester ().
Result| Result | Proceed to |
| "Airbag" is not displayed on the intelligent tester | A |
| Several ECUs and sensors in addition to "Airbag" are displayed on the intelligent tester | B |
| 4.CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (CENTER AIRBAG SENSOR ASSEMBLY CAN BRANCH WIRE) |
Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.
- Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
- When disconnecting the cable, some systems need to be initialized after the cable is reconnected ().
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Switch Condition | Specified Condition |
| E47-13 (CANH) - E47-22 (CANL) | Ignition switch off | 54 to 69 Ω |
Text in Illustration| *a | Rear view of wire harness connector
(to Center Airbag Sensor Assembly) |
| | REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (CENTER AIRBAG SENSOR ASSEMBLY) |
|
|
| OK | |
| |
| REPLACE CENTER AIRBAG SENSOR ASSEMBLY ()
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|
| 5.CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (AIR CONDITIONING AMPLIFIER ASSEMBLY) |
Disconnect the E35*1 or E81*2 air conditioning amplifier assembly connector.
*1: w/ Rear Air Conditioning System
*2: w/o Rear Air Conditioning System
Select "Bus Check" on the intelligent tester ().
Result| Result | Proceed to |
| "Air Conditioning Amplifier" is not displayed on the intelligent tester | A |
| Several ECUs and sensors in addition to "Air Conditioning Amplifier" are displayed on the intelligent tester | B |
| 6.CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (AIR CONDITIONING AMPLIFIER ASSEMBLY CAN BRANCH WIRE) |
Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.
- For vehicles with an SRS system:
- Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
- When disconnecting the cable, some systems need to be initialized after the cable is reconnected ().
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
w/ Rear Air Conditioning System| Tester Connection | Switch Condition | Specified Condition |
| E35-3 (CANH) - E35-4 (CANL) | Ignition switch off | 54 to 69 Ω |
w/o Rear Air Conditioning System| Tester Connection | Switch Condition | Specified Condition |
| E81-11 (CANH) - E81-12 (CANL) | Ignition switch off | 54 to 69 Ω |
Text in Illustration| *A | w/ Rear Air Conditioning System |
| *B | w/o Rear Air Conditioning System |
| *a | Front view of wire harness connector
(to Air Conditioning Amplifier Assembly) |
| | REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY) |
|
|
| OK | |
| |
| REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY ()
|
|
| 7.CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (HEADLIGHT SWIVEL ECU ASSEMBLY) |
- For vehicles without dynamic headlight auto leveling, go to "Check for Open in One Side of CAN Branch Wire (Main Body ECU)".
Disconnect the E101 headlight swivel ECU assembly connector.
Select "Bus Check" on the intelligent tester ().
Result| Result | Proceed to |
| "Headlight swivel (AFS)" is not displayed on the intelligent tester | A |
| Several ECUs and sensors in addition to "Headlight swivel (AFS)" are displayed on the intelligent tester | B |
| 8.CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (HEADLIGHT SWIVEL ECU ASSEMBLY CAN BRANCH WIRE) |
Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.
- For vehicles with an SRS system:
- Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
- When disconnecting the cable, some systems need to be initialized after the cable is reconnected ().
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Switch Condition | Specified Condition |
| E101-12 (MPX1) - E101-13 (MPX2) | Ignition switch off | 54 to 69 Ω |
Text in Illustration| *a | Rear view of wire harness connector
(to Headlight Swivel ECU Assembly) |
| | REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (HEADLIGHT SWIVEL ECU ASSEMBLY) |
|
|
| OK | |
| |
| REPLACE HEADLIGHT SWIVEL ECU ASSEMBLY ()
|
|
| 9.CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (MAIN BODY ECU) |
Disconnect the E3 main body ECU (cowl side junction block LH) connector.
Select "Bus Check" on the intelligent tester ().
Result| Result | Proceed to |
| "Main Body" is not displayed on the intelligent tester | A |
| Several ECUs and sensors in addition to "Main Body" are displayed on the intelligent tester | B |
| 10.CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (MAIN BODY ECU CAN BRANCH WIRE) |
Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.
- For vehicles with an SRS system:
- Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
- When disconnecting the cable, some systems need to be initialized after the cable is reconnected ().
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Switch Condition | Specified Condition |
| E3-5 (CANH) - E3-6 (CANL) | Ignition switch off | 54 to 69 Ω |
Text in Illustration| *a | Rear view of wire harness connector
(to Main Body ECU [Cowl Side Junction Block LH]) |
| | REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (MAIN BODY ECU) |
|
|
| OK | |
| |
| REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH) |
|
Check the vehicle specifications.
Result| Result | Proceed to |
| w/ Network Gateway ECU | A |
| w/o Network Gateway ECU | B |
| 12.CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (NETWORK GATEWAY ECU CAN BRANCH WIRE) |
Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.
- For vehicles with an SRS system:
- Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
- When disconnecting the cable, some systems need to be initialized after the cable is reconnected ().
Disconnect the E31 network gateway ECU connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Switch Condition | Specified Condition |
| E31-16 (CA1H) - E31-15 (CA1L) | Ignition switch off | 54 to 69 Ω |
Text in Illustration| *a | Rear view of wire harness connector
(to Network Gateway ECU) |
| | REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (NETWORK GATEWAY ECU) |
|
|
| OK | |
| |
| REPLACE NETWORK GATEWAY ECU ()
|
|
| 13.CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (CLEARANCE WARNING ECU ASSEMBLY) |
- For vehicles without an TOYOTA parking assist-sensor system, go to "Check for Open in One Side of CAN Branch Wire (4WD Control ECU)".
Disconnect the F12 clearance warning ECU assembly connector.
Select "Bus Check" on the intelligent tester ().
Result| Result | Proceed to |
| "Clearance Warning (Clearance Sonar)" is not displayed on the intelligent tester | A |
| Several ECUs and sensors in addition to "Clearance Warning (Clearance Sonar)" are displayed on the intelligent tester | B |
| 14.CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (CLEARANCE WARNING ECU ASSEMBLY CAN BRANCH WIRE) |
Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.
- For vehicles with an SRS system:
- Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
- When disconnecting the cable, some systems need to be initialized after the cable is reconnected ().
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Switch Condition | Specified Condition |
| F12-3 (CANH) - F12-5 (CANL) | Ignition switch off | 54 to 69 Ω |
Text in Illustration| *a | Front view of wire harness connector
(to Clearance Warning ECU Assembly) |
| | REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY) |
|
|
| OK | |
| |
| REPLACE CLEARANCE WARNING ECU ASSEMBLY ()
|
|
| 15.CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (4WD CONTROL ECU) |
Disconnect the A27 4WD control ECU connector.
Select "Bus Check" on the intelligent tester ().
Result| Result | Proceed to |
| "Four Wheel Drive Control" is not displayed on the intelligent tester | A |
| Several ECUs and sensors in addition to "Four Wheel Drive Control" are displayed on the intelligent tester | B |
| 16.CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH WIRE (4WD CONTROL ECU CAN BRANCH WIRE) |
Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.
- For vehicles with an SRS system:
- Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
- When disconnecting the cable, some systems need to be initialized after the cable is reconnected ().
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Switch Condition | Specified Condition |
| A27-19 (CAN+) - A27-20 (CAN-) | Ignition switch off | 54 to 69 Ω |
Text in Illustration| *a | Front view of wire harness connector
(to 4WD Control ECU) |
| | REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (4WD CONTROL ECU) |
|
|
| OK | |
| |
| REPLACE 4WD CONTROL ECU ()
|
|
| 17.CHECK FOR OPEN IN ONE SIDE OF BRANCH WIRE (SKID CONTROL ECU) |
Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.
- For vehicles with an SRS system:
- Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
- When disconnecting the cable, some systems need to be initialized after the cable is reconnected ().
Disconnect the A24 master cylinder solenoid (skid control ECU) connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Switch Condition | Specified Condition |
| A24-11 (CANH) - A24-25 (CANL) | Ignition switch off | 54 to 69 Ω |
Text in Illustration| *a | Front view of wire harness connector
(to Master Cylinder Solenoid [Skid Control ECU]) |
| | REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (SKID CONTROL ECU) |
|
|
| OK | |
| |
| REPLACE MASTER CYLINDER SOLENOID (SKID CONTROL ECU) ()
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