CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY
Disconnect the D101 air conditioning amplifier connector.
Measure the voltage and resistance according to the value(s) in the table below.
Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
---|---|---|---|---|
D101-1 (IG+) - D101-14 (GND) | Y - W-B | Ignition power supply | Ignition switch ON | 11 to 14 V |
Ignition switch off | Below 1 V | |||
D101-21 (B) - D101-14 (GND) | R - W-B | Battery power source | Always | 11 to 14 V |
D101-14 (GND) - Body ground | W-B - Body ground | Ground for main power supply | Always | Below 1 Ω |
D101-13 (SG-2) - Body ground | V - Body ground | Ground for air conditioning pressure sensor | Always | Below 1 Ω |
If the result is not as specified, there may be a malfunction on the wire harness side.
Reconnect the D101 air conditioning amplifier connector.
Measure the voltage according to the value(s) in the table below.
Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
---|---|---|---|---|
z3-2 (BUS G) - Body ground | - | Ground for BUS IC | Always | Below 1 Ω |
D101-23 (BLW) - D101-14 (GND) | G - W-B | Blower motor control signal |
|
Pulse generation (see waveform 1) |
D101-10 (S5-3) - D101-13 (SG-2) | B - V | Power supply for air conditioning pressure sensor | Ignition switch ON | 4.75 to 5.25 V |
D101-9 (PRE) - D101-13 (SG-2) | G - V | Air conditioning pressure sensor signal |
|
0.70 to 4.69 V |
|
Below 0.70 V | |||
|
4.69 V or higher | |||
D101-2 (SOL+) - D101-14 (GND) | LG - W-B | Compressor with pulley assembly operation signal |
|
Pulse generation (see waveform 2) |
D101-3 (PTC1) - Body ground | W - Body ground | PTC NO. 1 relay operation signal |
|
11 to 14 V* |
D101-22 (PTC2) - Body ground | B - Body ground | PTC NO. 2 relay operation signal |
|
11 to 14 V* |
D101-4 (PTC3) - Body ground | BR - Body ground | PTC NO. 3 relay operation signal |
|
11 to 14 V* |
D101-25 (ALT) - D101-14 (GND) | L - W-B | Generator signal (PTC Heater control) | Engine started | Pulse generation |
D101-27 (HLS) - D101-14 (GND) | B - W-B | Headlight signal (PTC Heater control) |
|
11 to 14 V |
|
Below 1 V | |||
z3-5 (SGA) - Body ground | - | Ground for evaporator temperature sensor | Always | Below 1 Ω |
z3-6 (TEA) - z3-5 (SGA) | - | Evaporator temperature sensor signal |
|
1.7 to 2.1 V |
|
0.9 to 1.3 V | |||
z3-3 (BUS) - z3-2 (BUS G) | - | BUS IC control signal | Ignition switch ON | Pulse generation |
z3-4 (B BUS) - z3-2 (BUS G) | - | Power supply for BUS IC | Always | 11 to 14 V |
*: After the measurement conditions are met, wait 30 seconds before performing measurements. If the result is not as specified, the air conditioning amplifier assembly may have a malfunction.
If the result is not as specified, the air conditioning amplifier assembly may have a malfunction.
Using an oscilloscope, check waveform 1.
Item | Content |
---|---|
Terminal No. (Symbol) | D101-23 (BLW) - D101-14 (GND) |
Tool Setting | 1 V/DIV., 500 μs/DIV. |
Condition | Ignition switch ON Blower switch LO |
Tech Tips
When the blower level is increased, the duty ratio changes accordingly.
Using an oscilloscope, check waveform 2.
Item | Content |
---|---|
Terminal No. (Symbol) | D101-2 (SOL+) - D101-14 (GND) |
Tool Setting | 5 V/DIV., 500 μs/DIV. |
Condition | Engine running A/C switch on Blower switch LO |
CHECK AIR CONDITIONING CONTROL ASSEMBLY
Disconnect the D12 control connector.
Measure the resistance and voltage according to the value(s) in the table below.
Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
---|---|---|---|---|
D12-5 (IG+) - D12-11 (GND) | P - BR | IG power supply | Ignition switch ON | 11 to 14 V |
D12-11 (GND) - Body ground | BR - Body ground | Ground | Always | Below 1 Ω |
If the result is not as specified, there may be a malfunction on the wire harness side.
CHECK MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)
Disconnect the DB, DE, DG and D80 ECU connectors.
Measure the voltage and resistance according to the value(s) in the table below.
Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
---|---|---|---|---|
DE-17 (GND1) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
D80-4 (GND2) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
DB-30 (BECU) - Body ground | W - Body ground | Power souse | Always | 11 to 14 V |
DG-1 (ALTB) - Body ground | W - Body ground | Power souse | Always | 11 to 14 V |
If the result is not as specified, there may be a malfunction on the wire harness side.