Displaying & Reading Trouble Codes

NOTE: This is the only information provided by the manufacturer for reading diagnostic trouble codes for this system.

PRE-CHECK

1. MULTIPLEX COMMUNICATION SYSTEM (BEAN)
a. BEAN communication line is used for 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 bus-down occurs, communication from related ECU will stop. Therefore, outputs of DTC will be impossible, so perform a DTC (SAE code) inspection with hand-held tester.

2. COMMUNICATION FUNCTION INSPECTION
a. Inspect the battery positive voltage.
Standard: 10 - 14 V

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

3. INSPECT OUTPUT OF DIAGNOSTIC 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.

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 detective, etc.




2. By using SST (diagnosis check wire), make a short-circuit between terminals TC (13) and CG (4) of the DLC3 connector.
SST 09843-18040

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, display will be started from the smaller 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 and therefore any DTC will not be output.
- When other DTC is output, refer to the DTC table and applicable section.
- When no DTC is output even in the normal condition, problems, such as short-circuit between terminals TC and CG, meter fuses defective etc., may exist.
- When the door open indicator is always on, wire harness might be short-circuited.

4. INSPECT OUTPUT OF DIAGNOSIS TROUBLE CODE WITH TOYOTA HAND-HELD TESTER
a. Battery Voltage Inspection:
Standard: 10 - 14 V

b. DTC Monitor Code Output Inspection:
1. Connect hand-held tester to the DLC3 and turn the ignition (starter) switch ON, then check the DTC.

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

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

HINT: When other DTC is output, refer to the DTC table and the applicable section.