Diagnostic Procedures

KOER P1127 -  Scan to connected. Turn ignition on, engine off. Access following PIDs:

• HTR11 (Front Bank 1).
• HTR21 (Front Bank 2).
• HTR12 (Rear Bank 1).
• HTR22 (Rear Bank 2).

Turn ignition off. If all PIDs indicate ON, perform KOER self-test. If all PIDs do not indicate ON, operate engine until all PIDs indicate ON. Refer to QUICK TEST  under SELF-DIAGNOSTIC SYSTEM.