Front A/C Ecu (W/ Navigation System): Notes

Remove A/C ECU, with connectors still connected. See A/C ECU (FRONT AMPLIFIER)  under REMOVAL & INSTALLATION. Turn ignition on unless instructed otherwise. Backprobe and measure voltage or check for continuity between indicated connector terminals. See Fig 1 and Fig 2 .

When measuring voltages between specified terminals, check for voltage changes during component activation. If circuits do not test as specified, inspect circuit and related components. See WIRING DIAGRAMS . If circuits test as specified, temporarily install a known-good A/C ECU and recheck operation of A/C system.