Check the heating mat.

Does the heating mat work?

--

System OK

Go to Step 2

Check the fuse F30.

Is fuse F30 blown?

--

Go to Step 3

Go to Step 4

1. Check for a short circuit and repair it, if necessary.
2. Replace the fuse F30.

Is the repair complete?

--

System OK

--

Use a voltmeter to check voltage at terminal 5 of each (left and right) heating mat switch.

Does the voltmeter indicate the specified value?

11-14 V

Go to Step 6

Go to Step 5

Repair the open circuit between the fuse F30 and the heating mat switch terminal 5.

Is the repair complete?

--

System OK

--

1. Turn the ignition switch ON.
2. Put the heating mat switch ON.
3. Use a voltmeter to check voltage at terminal 4 of each (left and right) heating mat switch.

Does the voltmeter indicate the specified value?

11-14 V

Go to Step 8

Go to Step 7

Replace the heating mat switch.

Is the repair complete?

--

System OK

--

1. Turn the ignition switch ON.
2. Put the heating mat switch ON.
3. Use a voltmeter to check the voltage at the heating mat terminal 1.

Does the voltmeter indicate the specified value?

11-14 V

Go to Step 10

Go to Step 9

Repair the open circuit between the left or right heating mat switch terminal 2 and the left or right heating mat terminal 1.

Is the repair complete?

--

System OK

--

1. Turn the ignition switch ON.
2. Put the heating mat switch ON.
3. Use a voltmeter to check the voltage at the terminal 2 of the heating mat.

Is the voltage indicate the specified value?

11-14 V

Go to Step 12

Go to Step 11

Replace the left or right heating mat.

Is the repair complete?

--

System OK

--

Replace the open ground circuit.

Is the repair complete?

--

System OK

--