Function Test

NOTE:

With climate control Before testing, troubleshoot the B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A )
Before testing, check the No 4 (40 A) fuse in the under-hood fuse/relay box and the No 16 (7 5 A) fuse in the driver's under-dash fuse/relay box
Be careful not to scratch or damage the defogger wires with the tester probe

Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, then turn the rear window defogger switch ON
Measure the voltage between the positive terminal (A) and body ground There should be battery voltage
- If there is no voltage, check for
  - Faulty rear window defogger relay (see POWER RELAY TEST )
  - Faulty climate control unit
  - Faulty glass antenna coil
  - An open in the GRN or WHT wire to the positive terminal
- If there is voltage, go to step 3
Fig 1: Measuring Voltage Between Positive Terminal And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Measure the voltage between the negative terminal (B) and body ground There should be less than 0 2 V
- If there is less than 0.2 V, go to step 4
- If there is more than 0.2 V, check for
- Open or high resistance in the wire
- Poor ground (G801)
Touch the voltmeter positive probe to each point on each defogger wire, and the negative probe to the negative terminal

If it is more than specified at one of the points, there is a break in the negative half of the wire
If it is less than specified at one of the points, there is a break in the positive half of the wire