Symptom Chart

Symptom	Possible Causes	Action
Charge warning lamp does not come on	Bulb/Circuit fault Generator fault CAN circuit fault Engine control module fault	Check the warning lamp function with the ignition on and the engine off. Replace bulbs or repair the circuit(s) as necessary. Check for DTCs indicating a generator, CAN or engine control module fault.
Charge warning lamp stays on/battery discharges	Accessory drive belt broken Generator pulley slipping on shaft Generator fault Battery cable fault CAN circuit fault Engine control module fault	Refer to the electrical circuit diagrams and test the generator circuit for short circuit to ground, short circuit to power, open circuit, high resistance Using the manufacturer approved diagnostic system, check the Engine Control Module (ECM) for related DTCs and refer to the relevant DTC index Check the auxiliary drive belt condition and tension Check that the pulley does not rotate independently of the generator
Charge warning lamp intermittent	Accessory drive belt slipping Battery cable fault Generator wiring fault Generator fault CAN circuit fault	Refer to the electrical circuit diagrams and test the generator circuit for short circuit to ground, short circuit to power, open circuit, high resistance Using the manufacturer approved diagnostic system, check the Engine Control Module (ECM) for related DTCs and refer to the relevant DTC index Check the auxiliary drive belt condition and tension Check that the pulley does not rotate independently of the generator
Battery discharges without the charge warning lamp staying on	Battery fault Battery quiescent drain Intermittent generator fault	Refer to the relevant section of the workshop manual and test the battery Refer to the relevant section of the workshop manual and test the battery quiescent drain Using the manufacturer approved diagnostic system, check the Engine Control Module (ECM) for related DTCs and refer to the relevant DTC index
Noise (mechanical)	Accessory drive belt slipping Generator fault	Check the auxiliary drive belt condition and tension Remove the auxiliary drive belt and check that the generator rotates freely