Wipers/Washers (MICU) Input Test

NOTE: Before performing the input tests, check the No. 38 (30 A) fuse in the under-dash fuse/relay box.

1.Turn the ignition switch OFF.

2.Remove the left kick panel.

3.Disconnect the driver's under-dash fuse/relay box connectors E, F, S, and T.

NOTE: All connector views are wire side of female terminals.

 

4.Inspect the connector and socket terminals to be sure they are all making good contact.

  • If the terminals are bent, loose or corroded, repair them as necessary and recheck the system.
  • If the terminals look OK, go to 5.

5.With the under-dash fuse/relay box connectors and MICU connectors still disconnected, make these input tests at the connector.

  • If any test indicates a problem, find and correct the cause, then recheck the system.
  • If all the input tests prove OK, go to 6.

Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained 
F18 BLU Under all conditions Connect battery power to the F18 terminal:
The wiper motor should run at low speed. 
  • Poor ground (G201)
  • Faulty windshield wiper motor
  • An open in the wire
 
F19 YEL Connect battery power to the F19 terminal:
The wiper motor should run at high speed. 
F32 WHT Under all conditions (disconnect the wiper motor 5P connector) Check for continuity between the F32 terminal and wiper motor 5P connector No. 5 terminal:
There should be continuity. 		An open in the wire 
F33 ORN Under all conditions Connect battery power to the F33 terminal:
The windshield washer motor should run. 
  • Poor ground (G201)
  • Faulty windshield washer motor
  • An open in the wire
 
S6
·
S4 		BLU
·
BLK 		Wiper/washer switch (intermittent dwell timer) turned Check resistance between S6 and S4 terminals:
The resistance should vary from about 0 to 30W. 
  • Faulty wiper/washer switch
  • An open in the wire
  • Short to ground
 


6.Reconnect the under-dash fuse/relay box connectors and MICU connectors, then make these input tests at the connector.

  • If any test indicates a problem, find and correct the cause, then recheck the system.
  • If all the input tests prove OK, the MICU must be faulty; replace the under-dash fuse/relay box assembly.

Cavity Wire Test condition Test: Desired result Possible cause if result is not obtained 
E6 BLK Under all conditions Check for voltage to ground:
There should be less than 0.5 V. 
  • Poor ground (G602)
  • An open in the wire
 
E33 BLK Under all conditions Check for voltage to ground:
There should be less than 0.5 V. 
  • Poor ground (G601)
  • An open in the wire
 
F20 BLK Under all conditions Check for voltage to ground:
There should be less than 0.5 V. 
  • Poor ground (G401)
  • An open in the wire
 
T34 BLK Under all conditions Check for voltage to ground:
There should be less than 0.5 V. 
  • Poor ground (G501)
  • An open in the wire
 
S10
·
S4 		ORN
·
BLK 		Wiper/washer switch (LOW) ON Check for voltage between S10 and S4 terminals, and S20 and S4 terminals:
There should be less than 0.5 V. 
  • Faulty wiper/washer switch
  • An open in the wire
 
Wiper/washer switch OFF Check for voltage between S10 and S4 terminals, and S20 and S4 terminals:
There should be 5 V or more. 
  • Faulty wiper/washer switch
  • Short to ground
 
S15
·
S4 		GRN
·
BLK 		Wiper/washer switch (MIST) ON Check for voltage between S15 and S4 terminals:
There should be less than 0.5 V. 
  • Faulty wiper/washer switch
  • An open in the wire
 
Wiper/washer switch (MIST) OFF Check for voltage between S15 and S4 terminals:
There should be 5 V or more. 
  • Faulty wiper/washer switch
  • Short to ground
 
S17
·
S4 		YEL
·
BLK 		Washer switch ON Check for voltage between S17 and S4 terminals:
There should be less than 0.5 V. 
  • Faulty wiper/washer switch
  • An open in the wire
 
Washer switch OFF Check for voltage between S17 and S4 terminals:
There should be 5 V or more. 
  • Faulty wiper/washer switch
  • Short to ground
 
S20
·
S4 		WHT
·
BLK 		Wiper/washer switch (INT) ON Check for voltage between S20 and S4 terminals:
There should be less than 0.5 V. 
  • Faulty wiper/washer switch
  • An open in the wire
 
Wiper/washer switch OFF Check for voltage between S20 and S4 terminals:
There should be 5 V or more. 
  • Faulty wiper/washer switch
  • Short to ground
 
Wiper/washer switch (HIGH) ON Check for voltage between S20 and S4 terminals:
There should be less than 0.5 V. 
  • Faulty wiper/washer switch
  • An open in the wire
 
Wiper/washer switch OFF Check for voltage between S20 and S4 terminals:
There should be 5 V or more. 
  • Faulty wiper/washer switch
  • Short to ground