Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.

CHECK AIR CONDITIONING AMPLIFIER

Remove the air conditioning amplifier with its connectors still connected.

Fig 1: Identifying C1 Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the wire harness side connector.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
c1 - 2 (BUB G) - Body ground	Below 1 Ω

NG: CHECK GROUND LINE AND AIR CONDITIONING AMPLIFIER

OK: Go to next step

CHECK AIR CONDITIONING AMPLIFIER

Remove the air conditioning amplifier with its connectors still connected.

Fig 2: Identifying C1 Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the voltage of the wire harness side connector.

Standard voltage

VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
c1 - 2 (BUBG) - c1-4 (B BUS)	Ignition switch ON	11 to 13 V
c1 - 2 (BUBG) - c1-3 (BUS)	Ignition switch ON	Pulse generation

NG: REPLACE AIR CONDITIONING AMPLIFIER

OK: REPLACE AIR CONDITIONING HARNESS ASSEMBLY