Highlander LTD 2WD V6-3.0L (1MZ-FE) (2002)
Step 6 - 7
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.