Toyota Sienna Service Manual: CAN Bus Line
DESCRIPTION
When any DTC for the CAN communication system is output, first measure the resistance between the terminals of the DLC3 to specify the trouble area, and check that there is no short in the CAN main wire, between the main wire, and +B or GND.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
- Turn the ignition switch off before measuring the resistances of CAN bus main wires and CAN bus branch wires.
- After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.
- Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches, or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.
HINT: Operating the ignition switch, any switches, or any doors triggers related ECU and sensor communication with the CAN. This communication will cause the resistance value to change.
1 CHECK CAN BUS WIRE (MAIN WIRE FOR DISCONNECTION, CAN BUS LINES FOR SHORT CIRCUIT)
- Turn the ignition switch off.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
2 CHECK FOR SHORT TO B+ IN CAN BUS WIRE
- Measure the resistance according to the value(s) in the table below.
Standard resistance
3 CHECK FOR SHORT TO GND IN CAN BUS WIRE
- Measure the resistance according to the value(s) in the table below.
Standard resistance
GO TO HOW TO PROCEED WITH TROUBLESHOOTING
ECM Communication Stop Mode
DESCRIPTION
Detection Item
Symptom
Trouble Area
ECM Communication Stop
Mode
"Engine" is not displayed on the "Communication
Bus Che ...
Open in CAN Main Bus Line
DESCRIPTION
There may be an open circuit in the CAN main bus wire and/or the DLC3 branch
wire when the resistance
between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 69 Ω or higher.
...
Other materials:
Removal
1. REMOVE REAR DOOR SCUFF PLATE
2. REMOVE REAR DOOR WEATHERSTRIP
3. REMOVE BACK DOOR WEATHERSTRIP
4. REMOVE BACK DOOR SCUFF PLATE
5. REMOVE FRONT QUARTER TRIM PANEL ASSEMBLY
Remove the floor anchor cover.
Remove the bolt and disconnect the No. 2 rear seat
outer belt assem ...
Stop light switch
ON-VEHICLE INSPECTION
1. STOP LIGHT SWITCH ASSEMBLY
Check the resistance between the terminals at each
switch position as shown ion the chart.
Resistance
...
Diagnostic trouble code chart
If a DTC is displayed during the DTC check, check the parts
listed in the table below and proceed to the page given.
HINT:
*1: Comes on MIL (Malfunction Indicator Lamp) light up
*2: "DTC stored" mark means ECM memorizes the
malfunction code if the ECM detects the DTC detection
...
