Toyota Highlander Service Manual: Diagnostic trouble code chart
Use Diagnostic Trouble Codes (DTCs) (from the DTC checks) in the table below
to determine the trouble
area and proper inspection procedure. The Supplemental Restraint System (SRS)
diagnostic trouble code
chart is shown below as an example.

HINT:
The most difficult case in troubleshooting is when no problem symptoms occur. In
such cases, a thorough
customer problem analysis must be carried out. A simulation of the same or
similar c ...
The suspected circuits or parts for each problem symptom are shown in the
table below. Use this table to
troubleshoot when, during a DTC check, a "Normal" code is displayed but the
problem is sti ...
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