Climate Control Unit Inspection (Auto A/C)
- Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(US)] .)
- Remove the climate control unit with the connector connected. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION (AUTO A/C (US)) .)
- Connect the negative battery terminal.
- Switch the ignition ON (engine off or on).
- Connect the negative (-) lead of the tester to body ground.
- Insert the positive (+) lead of the tester into each climate control unit terminal and measure the voltage according to the terminal voltage table.
- If there is any malfunction, inspect the parts under "Inspection item (s)".
Terminal Voltage Table (Reference)
TERMINAL VOLTAGE REFERENCE
| Terminal | Signal name | Connected to | Measurement condition | Voltage (V) | Inspection item (s) |
|---|---|---|---|---|---|
| 1A | B+ | F19 10 A fuse | Under any condition | B+ |
|
| 1B | - | - | - | - | - |
| 1C | IG | F47 15 A fuse | Switch the ignition ON (engine off or on) | B+ |
|
| Switch the ignition off | 1.0 or less | ||||
| 1D | Glove compartment light | Glove compartment light control | Light switch at TNS position | B+ |
|
| Light switch at OFF position | 1.0 or less | ||||
| 1E | - | - | - | - | - |
| 1F | - | - | - | - | - |
| 1G | GND | Body ground | Under any condition | 1.0 or less |
|
| 1H | - | - | - | - | - |
| 1I | HS_CAN_H | CAN related module | Because this terminal is for communication, integrity determination by terminal voltage is not possible. |
|
|
| 1J | HS_CAN_H | CAN related module | Because this terminal is for communication, integrity determination by terminal voltage is not possible. |
|
|
| 1K | HS_CAN_L | CAN related module | Because this terminal is for communication, integrity determination by terminal voltage is not possible. |
|
|
| 1L | HS_CAN_L | CAN related module | Because this terminal is for communication, integrity determination by terminal voltage is not possible. |
|
|
| 1M | - | - | - | - | - |
| 1N | - | - | - | - | - |
| 1O | - | - | - | - | - |
| 1P | - | - | - | - | - |
| 2A | HS_CAN_H | CAN related module | Because this terminal is for communication, integrity determination by terminal voltage is not possible. |
|
|
| 2B | Passenger compartment temperature sensor input | Passenger compartment temperature sensor | Compared with temperature detected by passenger compartment temperature sensor | Refer to graph |
|
| 2C | HS_CAN_L | CAN related module | Because this terminal is for communication, integrity determination by terminal voltage is not possible. |
|
|
| 2D | Sensor GND | Passenger compartment temperature sensor | Under any condition | 1.0 or less |
|
| 2E | - | - | - | - | - |
| 2F | - | - | - | - | - |
| 2G | - | - | - | - | - |
| 2H | - | - | - | - | - |