MULTIFUNCTION Switch

Disconnect multifunction switch connectors. With multifunction switch at specified position, check dimmer, flash-to-pass and turn/hazard portion of multifunction switch. If continuity does not exist, replace multifunction switch. See appropriate TESTING DIMMER, FLASH-TO-PASS & TURN/HAZARD PORTION OF MULTIFUNCTION SWITCH table. See Fig 1, Figure, Figure, Figure, or 5. If continuity exists as specified, go to next step.
With multifunction switch at specified position, check wiper/washer portion of multifunction switch. If continuity/resistance is not as specified, replace multifunction switch. Refer to the appropriate TESTING WIPER/WASHER PORTION OF MULTIFUNCTION SWITCH table. See Fig 1, Figure, Figure, Figure, or 5.

TESTING DIMMER, FLASH-TO-PASS & TURN/HAZ PORTION OF MULTIFUNC SWITCH

Switch Position		Check For Continuity Between Circuit No.
Left Turn Signal On & Hazard Switch Off		3, 44 & 52
Right Turn Signal On & Hazard Switch Off		2, 44 & 64
Hazard Switch
On		44 & 52; 64, 383 & 385
Off		298 & 385
Turn Signal Neutral (Off) & Hazard Switch Off		2, 64 & 810
Flash-To-Pass On		12 & 196; 13 & 15
Headlight Dimmer
On High Beam		12 & 15
On Low Beam		13 & 15

TESTING WIPER/WASHER PORTION OF MULTIFUNCTION SWITCH

Switch Position

Circuit No.

⁽¹⁾ Ohms

Wiper Switch

Off

589 & 993

47,600

Int

589 & 993

11,330

589 & 993

4080

589 & 993

⁽²⁾

Washer Switch On

590 & 993

⁽²⁾

Wiper Intermittent

590 & 993

⁽³⁾

⁽¹⁾	Specification can vary by as much as 10 percent.

⁽²⁾	Continuity should exist.

⁽³⁾	Rotate control from maximum delay to minimum delay. Resistance should gradually decrease from approximately 103 k/ohms to 3.3 k/ohms.

Fig 1: Identifying Multifunction Switch Circuit Terminals (Aerostar)

Courtesy of FORD MOTOR CO.