Communication Circuit Between Solar Ventilation ECU And A/C Amplifier

HEATING / AIR CONDITIONING: SOLAR VENTILATION SYSTEM: Communication Circuit between Solar Ventilation ECU and A/C Amplifier
- Communication Circuit between Solar Ventilation ECU and A/C Amplifier

DESCRIPTION

The solar ventilation ECU communicates with the A/C amplifier using a direct line. The A/C amplifier checks the condition of the solar ventilation system based on signals sent via the direct line.

When this circuit malfunctions, Data List items for the solar ventilation system will not be displayed.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (SOLAR VENTILATION ECU - A/C AMPLIFIER)

(a) Disconnect the solar ventilation ECU connector.





(b) Disconnect the A/C amplifier connector.





(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

2. REPLACE SOLAR VENTILATION ECU

(a) Replace the solar ventilation ECU with a known good one and check if the same problem occurs again Removal.

OK:

Same problem does not occur.

NG -- REPLACE A/C AMPLIFIER Removal

OK -- END (SOLAR VENTILATION ECU WAS DEFECTIVE)