1. Pre-check and visual inspection
1) Inspect the battery voltage.
- If there is a malfunction in the battery voltage, charge or replace the battery.
2) Inspect the fuses.
- If an abnormal condition such as a blowout is found in a fuse, inspect or repair the cause of the abnormal condition before replacing the fuse.
3) Inspect the ground point.
- If there is a failure with the ground point, repair and clean it.
4) Inspect the harnesses and connectors.
- Inspect for poor connections at the connectors, worn or bent harnesses, and for shorts to other circuits in the wires inside the harness, and repair as necessary.
5) Check for any interference from aftermarket electronic components.
- Turn OFF or remove any aftermarket electronic components such as two-way radios or lights to ensure that there is no influence on inspections or operations.
2. Components inspection
1) Inspect the fan switch.
- Inspect for continuity using a DMM, and replace the fan switch if a malfunction is found.
3. Inspection of circuit
1) Inspect the following circuits for abnormal conditions. If an abnormal condition is found, repair or replace.
Each terminal No. indicates the body harness side connector terminal.
- Between the No. 4 or No. 3 control lever terminal (8-pin type) and the No. 7 or No. 8 control lever terminal (8-pin type) {Short circuit in the wires} (Manual type)
- Between the blower module No. 2 terminal and No. 4 terminal {Short circuit in the wires} (Auto A/C type)
2) If all the components and circuits are normal at inspection, and no malfunction is found in the control panel power supply circuit, replace the control panel.