Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Low Beam Headlamp Supply Voltage

⁽²⁾

⁽²⁾

⁽⁴⁾

-

High Beam Headlamp Supply Voltage

⁽³⁾

⁽³⁾

⁽⁵⁾

-

Headlamp Low Beam Relay Control

⁽⁴⁾

⁽²⁾

⁽²⁾

-

Headlamp High Beam Relay Control

⁽⁵⁾

⁽³⁾

⁽²⁾

-

Headlamp Switch Headlamps OFF Signal

B257A 00

⁽⁷⁾

⁽⁷⁾⁽¹⁾

-

Headlamp Switch Headlamps On Signal

B257A 00

⁽²⁾

⁽²⁾⁽¹⁾

-

Park Lamp Switch ON Signal

B257A 00

B257A 00

B257A 00⁽¹⁾

-

Flash to Pass Switch Signal

⁽⁵⁾

⁽⁶⁾

⁽⁶⁾

-

Headlamp Dimmer Switch High Beam Signal

⁽⁵⁾

⁽³⁾

⁽³⁾

-

Low Beam Headlamp Ground

-

⁽²⁾

-

-

High Beam Headlamp Ground

-

⁽³⁾

-

-

Headlamp Switch Ground

-

⁽²⁾, ⁽³⁾

-

-

Turn Signal/Multifunction Switch Ground

-

⁽³⁾, ⁽⁶⁾

-

-

⁽¹⁾	Internal damage to the headlamp switch may occur if shorted to B+

⁽²⁾	Low Beam Headlamps Inoperative

⁽³⁾	High Beam Headlamp(s) Inoperative

⁽⁴⁾	Low Beam Headlamp(s) always ON

⁽⁵⁾	High Beam Headlamp(s) always ON

⁽⁶⁾	Flash to Pass Inoperative

⁽⁷⁾	Headlamp Defeat Inoperative