For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 |

1. Turn the ignition ON.
2. Use a voltmeter to test voltage at the ISU connector terminal D3.

Is voltage within the specified value?

11-14 V

Go to Step 3

Go to Step 2

2 | Repair the open circuit between the ISU connector terminal D3 and fuse F11. Is the repair complete? | -- | System OK | --
3 |

1. Turn the ignition ON.
2. Turn the wiper switch to INT.
3. Check the voltage at the ISU connector terminal B1.

Does the voltmeter indicate a voltage within the specified value?

11-14 V

Go to Step 7

Go to Step 4

4 | Check for an open circuit between wiper switch connector terminal C2 and ISU connector terminal B1. Is there an open circuit? | - | Go to Step 6 | Go to Step 5
5 | Replace the wiper switch. Refer to Windshield Wiper and Washer Switch Replacement . Is the repair complete? | -- | System OK | --
6 | Repair the open circuit between wiper switch connector terminal C2 and ISU connector terminal B1. Is the repair complete? | -- | System OK | --
7 |

1. Turn the ignition ON.
2. Turn the wiper switch to INT.
3. Check the voltage pulsing at the ISU connector terminal C3.

Does the voltmeter indicate a pulsating voltage within the specified value?

11-14 V

Go to Step 8

Go to Step 10

8 |

1. Turn the ignition ON.
2. Check the voltage at the wiper switch connector terminal A6.

Is the voltage pulsating at the specified value?

--

Go to Step 5

Go to Step 9

9 | Repair the open circuit between the wiper switch and the wiper relay. Is the repair complete? | -- | System OK | --
10 | Replace the ISU. Is the action complete? | -- | System OK | --