Test C: The High/Low Wiper Speeds Do Not Operate Correctly

PINPOINT TEST C: THE HIGH/LOW WIPER SPEEDS DO NOT OPERATE CORRECTLY

C1-C3:

C3-C5:

C6-C7:

C8-C10:

C10-C12:

Normal Operation
Under normal operation, when any wiper mode except OFF is selected, the multi-function switch provides a combination of grounds to the smart junction box (SJB) through circuits 61 (YE/RD), 63 (RD), 65 (DG) and 680 (LB/OG). The SJB interprets this ground combination to determine the desired wiper mode.

Voltage is provided to the high/low relay coil through circuit 1671 (RD). When low speed is commanded, the high/low relay is de-energized and voltage is sent to the wiper motor through circuit 58 (WH). When high speed is commanded, the smart junction box (SJB) provides ground to the high/low relay coil through circuit 647 (GY/LB). When the high/low relay is energized, voltage is sent from the high/low relay to the wiper motor through circuit 56 (DB/OG). When any wiper mode except OFF is selected, the multi-function switch provides a combination of grounds to the smart junction box (SJB) through circuits 61 (YE/RD), 63 (RD), 65 (DG) and 680 (LB/OG). The SJB interprets this ground combination to determine the desired wiper mode.

Possible Causes
- An open in circuit 56 (DB/OG), 58 (WH), 647 (GY/LB), 680 (LB/OG) or 1671 (RD)
- A short to voltage in circuit 647 (GY/LB)
- A short to ground in circuit 647 (GY/LB), 680 (LB/OG)
- A short together in circuit 56 (DB/OG) and 58 (WH) or 63 (RD) and 680 (LB/OG)
- Wiper high/low relay
- Wiper motor
- Multi-function switch
- Smart junction box (SJB)