Inspection of Rain / Light Sensor and Its Circuit (If Equipped)
Precautions: Precautions for Working on Rain-Sensing Wiper System · Precautions for Body, Cab and Accessories · General safety (00)
Voltage and Signal Check
1)Remove harness cover.
2)Check voltage using circuit tester or oscilloscope.
NOTE:
•Check that battery voltage is 12 V or more.
•Outputs from terminals marked with asterisk (*) cannot be measured with voltmeter because they are pulse signals. Use oscilloscope for its check if necessary.
•Outputs from terminals marked with asterisk (*) cannot be measured with voltmeter because they are pulse signals. Use oscilloscope for its check if necessary.
| [A]: | Rain / light sensor connector (View: [a]) |
“K11” connector
| Terminal No. | Circuit | Wire color | Normal voltage | Condition |
|---|---|---|---|---|
| K11-1* | CAN communication LO | WHT | Refer to reference waveform. CAN communication signal |
|
| K11-2* | CAN communication HI | RED | ||
| K11-4 | GND | BLK | Approx. 0 V | — |
| K11-5 | IG2 power supply | GRN | Approx. 12 V | Ignition: “ON” |
Reference Waveform
Oscilloscope display
Shown below is typical waveform display provided by oscilloscope.
NOTE:
•Display includes the following types of data:
•Waveform varies depending on measurement condition and vehicle spec.
| [a]: | Waveform of channel 1 | [c]: | VOLT/DIV of each channel |
| [b]: | Ground level of each channel | [d]: | TIME/DIV |
CAN communication signal
| Channel | Probe | Terminal No. |
|---|---|---|
| CH1 | + | K11-1 |
| – | K11-4 | |
| CH2 | + | K11-2 |
| – | K11-4 |
Measurement condition
•Ignition: “ON”
| 1. | CAN communication signal | [b]: | CH1 |
| [a]: | CH2 |