Circuit Description

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.

This circuit is used to read the DTCs that are output from the transponder key ECU with the hand-held tester.

HINT:

There are 2 DTCs that are output from the ECM:

DTC B2799 can be read with the hand-held tester and DTC 99 can be read with the check wire.
These DTCs are output to the same circuit as "SFI system" and "cruise control system" (For detailed inspection procedure, see DLC3 CIRCUIT ).
When each warning light keeps blinking, a ground short in the wiring of terminal TC of the DLC3 or an internal ground short in each ECU is suspected.