AC–52 AIR CONDITIONING SYSTEM – TROUBLESHOOTING Back Up Power Source Circuit CIRCUIT DESCRIPTION This is the back up power source for the A/C amplifier. Power is supplied even when the ignition switch is off and is used for diagnostic sensor check memory, etc. WIRING DIAGRAM R/B No.2 R/B No.2 A/C Amplifier 1 POWER B 2A ALT 2 W 2 2 W-L 2 1B J/B No.1 ECU-B Battery 13 1E W-R 7 A14 +B N13033