Air Conditioning System (For Hatchback) Heater Control Switch Circuit
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
INSPECT NO. 3 HEATER CONTROL SUB-ASSEMBLY (A/C SWITCH, A/C LED, MAX HOT SWITCH)
CHECK HARNESS AND CONNECTOR (NO. 3 HEATER CONTROL SUB-ASSEMBLY - IG1 NO. 1 RELAY)
CHECK HARNESS AND CONNECTOR (NO. 3 HEATER CONTROL SUB-ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)
AIR CONDITIONING SYSTEM (for Hatchback) - Heater Control Switch Circuit |
DESCRIPTION
The No. 3 heater control sub-assembly (A/C switch*1, A/C LED*1, MAX HOT switch*2) is powered through the A/C fuse. The No. 3 heater control sub-assembly (A/C switch*1, A/C LED*1, MAX HOT switch*2) transmits operational signals of each switch to the air conditioning amplifier assembly.- *1: w/ Cooler
- *2: w/ PTC Heater
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- Inspect the fuses for circuits related to this system before performing the following inspection procedures.
| 1.INSPECT NO. 3 HEATER CONTROL SUB-ASSEMBLY (A/C SWITCH, A/C LED, MAX HOT SWITCH) |
Inspect the No. 3 heater control sub-assembly (A/C switch*1, A/C LED*1, MAX HOT switch*2) (YARIS_NCP93 RM00000314R026X.html).
- *1: w/ Cooler
- *2: w/ PTC Heater
| 2.CHECK HARNESS AND CONNECTOR (NO. 3 HEATER CONTROL SUB-ASSEMBLY - IG1 NO. 1 RELAY) |
Disconnect the D127 No. 3 heater control sub-assembly (A/C switch*1, A/C LED*1, MAX HOT switch*2) connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection
| Switch Condition
| Specified Condition
|
D127-2 (B) - Body ground*1
| Ignition switch ON
| 11 to 14 V
|
D127-2 (B) - Body ground*1
| Ignition switch off
| Below 1 V
|
D127-7 (B) - Body ground*2
| Ignition switch ON
| 11 to 14 V
|
D127-7 (B) - Body ground*2
| Ignition switch off
| Below 1 V
|
- *1: w/ Cooler
- *2: w/ PTC Heater
Text in Illustration*A
| w/ Cooler
|
*B
| w/ PTC Heater
|
*a
| Front view of wire harness connector
(to No. 3 Heater Control Sub-Assembly (A/C Switch, A/C LED, MAX HOT Switch))
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 3.CHECK HARNESS AND CONNECTOR (NO. 3 HEATER CONTROL SUB-ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY) |
Disconnect the D127 No. 3 heater control sub-assembly (A/C switch*1, A/C LED*1, MAX HOT switch*2) connector.
Disconnect the D130 air conditioning amplifier assembly connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
D127-3 (A/C) - D130-2 (A/C)*1
| Always
| Below 1 Ω
|
D127-4 (AIND) - D130-16 (LED)*1
| Always
| Below 1 Ω
|
D127-8 (E) - D130-3 (HEAT)*2
| Always
| Below 1 Ω
|
D127-3 (A/C) - Body ground*1
| Always
| 10 kΩ or higher
|
D127-4 (AIND) - Body ground*1
| Always
| 10 kΩ or higher
|
D127-8 (E) - Body ground*2
| Always
| 10 kΩ or higher
|
- *1: w/ Cooler
- *2: w/ PTC Heater
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
