Precharge Relay Switch Inspection

Ignition "OFF".
Disconnect the auxiliary battery (-) connector.
Remove the safety plug, and check that the high voltage terminal voltage is less than 30V.
Connect auxiliary battery (+) connector inside the engine room.
Ignition ON, not ready.
Connect KDS to Data Link Connector (DLC).
Select BMS actuation test.
Perform "Precharge Relay ON" of "Actuation Test" with KDS.
Measure the value using "Multimeter" and monitor specifications below.

Inspection Condition	(+) Probe		(-) Probe		Specification
Inspection Condition	Connector	Terminal	Connector	Terminal	Specification
Ignition "ON".	Power relay assembly	(+)	Hybrid inverter	(+)	"ON": Approx. 40Ω ±5%/"OFF": ∞ (infinity)Ω

G14968987

Courtesy of KIA MOTORS AMERICA, INC.

Good

Go to "Main (+)/(-) Relay Resistance Inspection" procedure.

No Good

If no problems were found with the circuits or connectors, replace the precharge relay and Go to "Verification Of Repair " procedure.

Main (+)/(-) Relay Resistance Inspection
Inspection Condition	(+) Probe		(-) Probe		Specification
Inspection Condition	Connector	Terminal	Connector	Terminal	Specification
Ignition "OFF". Disconnect the auxiliary battery (-) connector. Remove the safety plug, and check that the high voltage terminal voltage is less than 30V. Disconnect the electrical connector(s) from the concerned component.	BMU connector	Main RLY (+)	BMU connector	Relay ground	Approx. 25.2 to 30.8Ω (20°C (68° F))
	BMU connector	Main RLY (-)	BMU connector	Relay ground	Approx. 25.2 to 30.8Ω (20°C (68° F))

Good

Go to "MAIN (+) RELAY SWITCH INSPECTION " procedure.

No Good

If no problems were found with the circuits or connectors, replace the main relay and Go to "Verification Of Repair " procedure.