Pre-Check

PRE-CHECK

1. MULTIPLEX COMMUNICATION SYSTEM (BEAN)

The BEAN communication line is used for the body, meters and air conditioning controls. Since the line is loop-shaped, the communication can be kept by the line that is not open even if a part of the line becomes open for some reasons. In case that the line becomes short (bus-down) for some reasons, however, all the BEAN communication will be impossible and some DTC will be output.

HINT: When a bus-down occurs, the communication from the related ECU will stop. Therefore, an outputs of a DTC will be impossible. So, perform a DTC (SAE code) inspection with the hand-held tester.

2. COMMUNICATION FUNCTION INSPECTION

a. Inspect the battery positive voltage.

Standard: 10 - 14 V

b. Perform a DTC check of the body ECU by connecting the hand-held tester to the DLC3 and turning the ignition switch ON.
Check that the DTCs of the ECU unconnected and also a short-circuit in the communication bus are not output.

3. INSPECT OUTPUT OF DTC BY DOOR OPEN INDICATOR

a. Inspect the battery positive voltage.

Standard: 10 - 14 V (when engine stopped)

b. Check the DTC output.

NOTE: No abnormality exists in all the following items; door open indicator LED, wire harness, courtesy lamp switch's contact condition, multiplex network body ECU, etc.

1. Check that the door open indicator will be on when any of the doors is opened.

HINT: In case that the indicator will not be on, the following problems are possible reasons; door open indicator LED defective, wire harness short, courtesy light switch's contact condition defective, multiplex network body ECU defective, etc.




2. Using SST (diagnosis check wire), make a short-circuit between terminals TC (13) and CG (4) of the DLC3 connector.

SST O9843-18040

NOTE: Do not make a short-circuit in any other positions.




3. Turn the ignition (starter) switch ON and read the number of blinks of the door open indicator.

HINT: When 2 or more codes are output simultaneously, the display will be started from the smallest numbered code.

4. When the DTC of the ECU unconnected is displayed, perform an inspection depending on the troubleshooting.

HINT:
- When the communication bus is defective, the door open indicator in the meter will not be on. Therefore no DTC will be output.
- When other DTCs are output, refer to the DTC chart and applicable section.
- When no normal output is output even in the normal condition, problems, such as a short-circuit between terminals TC and CG, meter fuses defective, etc., may exist.
- When the door open indicator is always on, the wire harness might be short-circuited.

4. INSPECT OUTPUT OF DTC WITH HAND-HELD TESTER

a. Inspect the battery positive voltage.

Standard: 10 - 14 V

b. Inspect the DTC monitor code output.
1. Connect the hand-held tester to the DLC3 and turn the ignition (starter) switch ON, then check the DTC.

HINT:
When the DTC check is impossible, check the following items.
- ECU data monitor is possible (multiplex network body ECU is defective).
- The display shows a communication error (refer to the new diagnostic system and operations when an error occurred).

2. When the display shows DTCs that the ECU is unconnected and the communication bus is defective, perform an inspection depending on the troubleshooting.

HINT: When other DTCs are output, refer to the DTC chart and applicable section.