Part 1
NETWORKING: CAN COMMUNICATION SYSTEM: TERMINALS OF ECU
TERMINALS OF ECU
HINT: Operating the engine switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.
1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
NOTICE:
- Before measuring the resistance, leave the vehicle for at least 1 minute and do not operate the engine switch, any switches or doors. If doors need to be opened in order to check connectors, open the doors and leave them open.
- W/ Navigation System:
After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal.
2. JUNCTION CONNECTOR
(a) NO. 1 JUNCTION CONNECTOR
(b) NO. 2 JUNCTION CONNECTOR
- *1: W/ Navigation System
- *2: W/O Navigation System
(c) NO. 3 JUNCTION CONNECTOR
(d) NO. 4 JUNCTION CONNECTOR
(e) NO. 5 JUNCTION CONNECTOR
- *: W/ Dynamic Radar Cruise Control System
(f) NO. 6 JUNCTION CONNECTOR
- *: W/ Wide View Front and Side Monitor System
(g) NO. 7 JUNCTION CONNECTOR
(h) NO. 8 JUNCTION CONNECTOR
(i) NO. 9 JUNCTION CONNECTOR
- *: W/ LEXUS Link System
(j) NO. 10 JUNCTION CONNECTOR
(k) NO. 1 CAN JUNCTION CONNECTOR
(l) NO. 2 CAN JUNCTION CONNECTOR
- *: W/ Power Back Door System
3. TERMINALS OF CONNECTORS FOR JUNCTION CONNECTOR (CAN JUNCTION CONNECTOR)
4. CHECK DLC3
(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.
NOTE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.
(b) Measure the resistance according to the value(s) in the table below.
5. CHECK MASTER CYLINDER SOLENOID (SKID CONTROL ECU)
(a) Disconnect the A24 ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
6. CHECK AIR CONDITIONING AMPLIFIER
(a) Disconnect the E35 and E36 amplifier connectors.
(b) Measure the voltage and resistance according to the value(s) in the table below.
7. CHECK ECM
(a) Disconnect the A38 and C53 ECM connectors.
(b) Measure the resistance according to the value(s) in the table below.
8. CHECK MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)
(a) Disconnect the E3 ECU connector.
(b) Disconnect the 2A and 2D junction connectors.
(c) Measure the resistance according to the value(s) in the table below.
- *1: For V bus
*2: For MS bus
9. CHECK COMBINATION METER
(a) Disconnect the E77 meter connector.
(b) Measure the resistance according to the value(s) in the table below.
- *1: For V bus
*2: For MS bus
10. CHECK CENTER AIRBAG SENSOR
(a) Disconnect the E47 sensor connector.
(b) Measure the resistance according to the value(s) in the table below.
11. CHECK DISPLAY AND NAVIGATION MODULE DISPLAY
- For vehicles with the navigation system only.
(a) Disconnect the F28 display connector.
(b) Measure the resistance according to the value(s) in the table below.
12. CHECK MULTI-DISPLAY
- For vehicles without the navigation system only.
(a) Disconnect the F28 multi-display connector.
(b) Measure the resistance according to the value(s) in the table below.
13. CHECK STEERING ANGLE SENSOR
(a) Disconnect the E11 sensor connector.
(b) Measure the resistance according to the value(s) in the table below.
14. CHECK YAW RATE SENSOR
(a) Disconnect the E50 sensor connector.
(b) Measure the resistance according to the value(s) in the table below.
15. CHECK SEAT BELT CONTROL ECU
- For vehicles with the dynamic radar cruise control system only.
(a) Disconnect the E41 and E42 ECU connectors.
(b) Measure the resistance according to the value(s) in the table below.
