Inspection Procedure

WARNING: This page is about a different car, the 2002 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

Check wire harness .
PREPARATION: Disconnect connector "G1" of gateway ECU, "A7" of A/C amplifier and "C11" of combination meter ECU.

Fig 1: Testing Wire Harness Gateway ECU To A/C Amplifier & A/C Amplifier To Combination Meter For Continuity
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CHECK
1. Check continuity between terminals MPD1 of gateway ECU and MP2+ of A/C amplifier.
2. Check continuity between terminals MPX+ of A/C amplifier and MPX- of combination meter ECU.
OK: There is a continuity in wire harness of both ( a and ( b or if continuity in either ( a or ( b, repair circuit without continuity and retest to confirm.

NOTE: If there is OPEN in wire harness of either ( a or ( b, please repair it.
1. NG: Repair or replace wire harness.
2. OK: Replace the A/C amplifier.