Instrument Panel Illumination Lamps Inoperative

Step	Action	Value(s)	Yes	No
1	Inspect fuse Ef28 Is fuse Ef28 open?	-	Go to Step 2	Go to Step 3
2	Inspect for a short circuit and repair it, if necessary. Replace the open fuse. Is the repair complete?	-	System OK	-
3	Turn the lamp switch ON. Use a voltmeter to measure the voltage at fuse Ef28. Does the battery voltage measure within the specified value?	11-14 V	Go to Step 5	Go to Step 4
4	Repair the open power supply circuit to fuse Ef28. Is the repair complete?	-	System OK	-
5	Use an ohmmeter to measure the resistance between ground and the BK wire of the dimmer control switch connector. Is the resistance equal to the specified value?	0 Ω	Go to Step 7	Go to Step 6
6	Repair the open ground circuit. Is the repair complete?	-	System OK	-
7	Turn the lamp switch ON. Use a voltmeter to measure the battery voltage at the BN/WH wire of the dimmer control switch connector. Does the battery voltage measure within the specified range?	11-14 V	Go to Step 9	Go to Step 8
8	Repair the open circuit between the BN/WH wire of the dimmer control switch connector and fuse EF28. Is the repair complete?	-	System OK	-
9	Disconnect the dimmer control switch. Turn the lamp switch ON. Use a voltmeter to measure the battery voltage at the D-GN wire of the dimmer control switch connector. Does the battery voltage measure within the specified range?	11-14 V	Go to Step 11	Go to Step 10
10	Repair the open circuit between the D-GN wire of the dimmer control switch connector switch connector and each lamps. Is the repair complete?	-	System OK	-
11	Replace the dimmer control switch. Is the repair complete?	-	System OK	-