A/c-Heater System - Automatic: Wiring Subaru SVX I

Ambient Temperature Sensor Harness Check

1. Turn ignition on. Measure voltage between terminal No. 2 (White/Green wire) of ambient temperature sensor connector and ground. If voltage reading is approximately 5 volts, go to next step. If voltage reading is not approximately 5 volts, check auto amplifier connectors for proper installation. If connectors are okay, replace auto amplifier.
2. Measure voltage between terminals No. 1 (Green/Black wire) and No. 2 (White/Green wire) of ambient temperature sensor connector. If voltage reading is not approximately 5 volts, check auto amplifier connectors for proper installation. Clean or repair connectors as necessary. If connectors are okay, replace auto amplifier. If voltage reading is approximately 5 volts, check auto amplifier output voltage.

Evaporator Temperature Sensor Harness Check

1. Turn ignition on. Measure voltage between Yellow/Red wire of evaporator temperature sensor connector and ground. If voltage reading is approximately 5 volts, go to next step. If voltage reading is not approximately 5 volts, check auto amplifier connectors for proper installation. Clean or repair connectors as necessary. If connectors are okay, replace auto amplifier.
2. Measure voltage between Yellow/Red and Green/White wires of evaporator temperature sensor connector. If voltage reading is not approximately 5 volts, check auto amplifier connectors for proper installation. If connectors are okay, replace auto amplifier. If voltage reading is approximately 5 volts, check auto amplifier output voltage.

Refrigerant Temperature Sensor Harness Check

1. Turn ignition on. Measure voltage between Brown/White wire of refrigerant temperature sensor connector and ground. If voltage reading is approximately 5 volts, go to next step. If voltage reading is not approximately 5 volts, check auto amplifier connectors for proper installation. If connectors are okay, replace auto amplifier.
2. Measure voltage between Brown/White and Green/White wires of refrigerant temperature sensor connector. If voltage reading is not approximately 5 volts, check auto amplifier connectors for proper installation. Clean or repair connectors as necessary. If connectors are okay, replace auto amplifier. If voltage reading is approximately 5 volts, check auto amplifier output voltage.

Water Temperature Sensor Harness Check

1. Turn ignition on. Measure voltage between Red wire of water temperature sensor connector and ground. If voltage reading is approximately 5 volts, go to next step. If voltage reading is not approximately 5 volts, check auto amplifier connectors for proper installation. Clean or repair connectors as necessary. If connectors are okay, replace auto amplifier.
2. Measure voltage between Red and White wires of water temperature sensor connector. If voltage reading is not approximately 5 volts, check auto amplifier connectors for proper installation. Clean or repair connectors as necessary. If connectors are okay, replace auto amplifier. If voltage reading is approximately 5 volts, check auto amplifier output voltage.

Air Mix Door Motor Wiring Harness Check

1. Disconnect auto amplifier connectors. With air mix door motor connector disconnected, measure resistance between terminal No. 1 (Blue/White wire) of auto amplifier 20-pin connector and terminal No. 3 (Blue wire) of air mix door motor connector. Resistance should be zero ohms.
2. Measure resistance between terminal No. 14 (Black/White wire) of auto amplifier 20-pin connector and terminal No. 6 (Brown wire) of air mix door motor connector. Resistance should be zero ohms.
3. Measure resistance between terminal No. 11 (Green/Black wire) of auto amplifier 20-pin connector and terminal No. 2 (White wire) of air mix door motor connector. Resistance should be zero ohms.
4. If resistance readings are not as specified, check auto amplifier connectors for proper installation. Clean or repair connectors as necessary. If connectors are okay, replace auto amplifier. If resistance readings are okay, go to next step.
5. Measure resistance between ground and terminals No. 11 (Green/Black wire), No. 14 (Black/White wire), and No. 3 (Blue wire) of auto amplifier 20-pin connector. Resistance readings should be infinite. If resistance readings are not as specified, check and repair wiring harness as necessary. If resistance readings are okay, replace air mix door motor.

Mode Door Motor Wiring Harness Check

1. Disconnect auto amplifier connectors. With mode door motor connector disconnected, measure resistance between terminal No. 1 (Blue/White wire) of auto amplifier 20-pin connector and terminal No. 3 (Blue wire) of air mix door motor connector. Resistance should be zero ohms.
2. Measure resistance between terminal No. 14 (Black/White wire) of auto amplifier 20-pin connector and terminal No. 6 (Brown wire) of air mix door motor connector. Resistance should be zero ohms.
3. Measure resistance between terminal No. 11 (Green/Black wire) of auto amplifier 20-pin connector and terminal No. 2 (White wire) of air mix door motor connector. Resistance should be zero ohms.
4. If resistance readings are not as specified, check auto amplifier connectors for proper installation. Clean or repair connectors as necessary. If connectors are okay, replace auto amplifier. If resistance readings are okay, go to next step.
5. Measure resistance between ground and terminals No. 11 (Green/Black wire), No. 14 (Black/White wire), and No. 3 (Blue wire) of auto amplifier 20-pin connector. Resistance readings should be infinite. If resistance readings are not as specified, check and repair wiring harness as necessary. If resistance readings are okay, replace air mix door motor.

1. Disconnect auto amplifier and air mix door motor connectors. Measure resistance between terminal No. 6 (Green/Yellow wire) of auto amplifier 16-pin connector and terminal No. 5 (Green/Black wire) of air mix door motor connector. Resistance should be zero ohms.
2. Measure resistance between terminal No. 5 (Green/Black wire) of auto amplifier 16-pin connector and terminal No. 7 (Yellow wire) of air mix door motor connector. Resistance should be zero ohms. If resistance is not as specified, check and repair wiring harness as necessary. If resistance is okay, go to next step.
3. Measure resistance between ground and terminals No. 6 (Green/Yellow wire) and No. 5 (Green/Black wire) of auto amplifier 16-pin connector. Resistance readings should be infinite. If resistance readings are not as specified, check and repair wiring harness as necessary. If resistance readings are okay, replace air mix door motor.

1. Disconnect auto amplifier and mode door motor connectors. Measure resistance between terminal No. 3 (Green/Red wire) of auto amplifier 16-pin connector and terminal No. 5 (Red/White wire) of mode door motor connector. Resistance should be zero ohms.
2. Measure resistance between terminal No. 4 (Light Green/Black wire) of auto amplifier 16-pin connector and terminal No. 7 (White/Red wire) of mode door motor connector. Resistance should be zero ohms. If resistance is not as specified, check and repair wiring harness as necessary. If resistance is okay, go to next step.
3. Measure resistance between ground and terminals No. 3 (Green/Red wire) and No. 4 (Light Green/Black wire) of auto amplifier 16-pin connector. Resistance readings should be infinite. If resistance readings are not as specified, check and repair wiring harness as necessary. If resistance readings are okay, replace mode door motor.

Intake Door Motor Wiring Harness Check

1. Disconnect auto amplifier connectors. With intake door motor connector disconnected, measure resistance between terminal No. 5 (Green/wire) at 20-pin connector of auto amplifier and terminal No. 6 (Green/Yellow wire) of intake door motor connector. Resistance should be zero ohms.
2. Measure resistance between terminal No. 6 (Green/Yellow wire) at 20-pin connector of auto amplifier and terminal No. 3 (Black/Yellow wire) of intake door motor connector. Resistance should be zero ohms.
3. Measure resistance between terminal No. 7 (Green/White wire) of auto amplifier 20-pin connector and terminal No. 2 (White/Green wire) of intake door motor connector. Resistance should be zero ohms.
4. Measure resistance between terminal No. 11 (Green/Black wire) of auto amplifier 20-pin connector and terminal No. 1 (Blue/White wire) of intake door motor connector. Resistance should be zero ohms.
5. If resistance readings are not as specified, check auto amplifier connectors for proper installation. Clean or repair connectors as necessary. If connectors are okay, replace auto amplifier. If resistance readings are okay, go to next step.
6. Measure resistance between terminal No. 5 (Green wire), No. 6 (Green/Yellow wire), No. 7 (Green/White wire), and No. 11 (Green/Black wire) of auto amplifier 20-pin connector and ground. Resistance readings should be infinite. If resistance readings are not as specified, check and repair wiring harness as necessary. If resistance readings are okay, replace intake door motor.