Air Conditioning System (For Automatic Air Conditioning System) Heater Relay Circuit
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
INSPECT HTR RELAY
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY)
CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (HR VOLTAGE)
AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System) - Heater Relay Circuit |
DESCRIPTION
The heater relay is turned on by signals from the air conditioning amplifier. The heater relay supplies power to the blower motor control.
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
Remove the HTR relay from the driver side junction block.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
3 - 4
| Battery voltage is not applied to terminals 1 and 2
| Below 1 Ω
|
3 - 5
| 10 kΩ or higher
|
3 - 4
| Battery voltage is applied to terminals 1 and 2
| 10 kΩ or higher
|
3 - 5
| Below 1 Ω
|
| 2.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY) |
Disconnect the A16 amplifier connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection
| Switch Condition
| Specified Condition
|
A16-14 (HR) - Body ground
| Ignition switch ON
| 11 to 14 V
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 3.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (HR VOLTAGE) |
Remove the air conditioning amplifier with its connectors still connected.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection
| Switch Condition
| Specified Condition
|
A16-14 (HR) - Body ground
| Ignition switch off
Blower switch OFF
| Below 1 V
|
Ignition switch ON
Blower switch ON
| Below 1 V
|
Ignition switch ON
Blower switch OFF
| 11 to 14 V
|
