B1312

B1312; HEADLAMP CIRCUIT MALFUNCTION

G256924t2: CHECK THE HEADLAMP TO ASU PWM SIGNAL CIRCUIT FOR HIGH RESISTANCE
1. Disconnect the battery negative terminal.
2. Disconnect the ASU electrical connector, CR89.
3. Disconnect the right-hand headlamp electrical connector, ECO6.
4. Disconnect the left-hand headlamp electrical connector, EC57.
5. Measure the resistance between CR89, pin 03 (Y) and ECO6, pin 02 (Y).
6. Measure the resistance between CR89, pin 03 (Y) and EC57, pin 02 (YB).
^ Is either resistance greater than 5 ohms?
-> Yes
REPAIR the high resistance circuit. CLEAR the DTC. TEST the system for normal operation.
-> No

G256924t3: CHECK THE HEADLAMP TO ASU PWM SIGNAL CIRCUIT FOR SHORT TO GROUND
1. Reconnect the battery negative terminal.
2. Measure the resistance between CR89, pin 03 (Y) and GROUND.
^ Is the resistance less than 10,000 ohms?
-> Yes
REPAIR the short circuit. CLEAR the DTC. TEST the system for normal operation.
-> No

G256924t4: CHECK THE HEADLAMP TO ASU PWM SIGNAL CIRCUIT FOR SHORT TO B+
1. Measure the voltage between CR89, pin 03 (Y) and GROUND.
^ Is the voltage greater than 3 volt?
-> Yes
REPAIR the short circuit. CLEAR the DTC. TEST the system for normal operation.
-> No
CONTACT dealer technical support for confirmation of possible control module failure, and/or raise an EPQR.