J: All Warning Indicators Inoperative

J1 Check Supply Fuse 12 (5A)
- Check output side of Fuse 12 (5A) using a voltmeter.

Is B+ present?

Yes
GO to J3.
No
GO to J2.

J2 Check For Voltage To Fuse 12 (5A)
- Check supply side of Fuse 12 (5A) using a voltmeter.

Is B+ present?

Yes
GO to J4.
No
SERVICE Circuit 16 (R/LG) for open circuit. RESTORE vehicle. RETEST system.

J3 Check Circuit 640 (R/Y) For Open Circuit
- Remove instrument cluster as described.
- Disconnect instrument cluster connector C250
- Check for resistance between Fuse 12 (5A) output side and Pin C250, Circuit 640 (R/Y).

Is resistance 5 ohms or less?

Yes
REPLACE instrument cluster printed circuit. RESTORE vehicle. RETEST system.
No
SERVICE Circuit 640 (R/Y) for open circuit. RESTORE vehicle. RETEST system.

J4 Check Circuit 640 (R/Y) For Short
- Using an ohmmeter connected to a known good ground, connect second lead to output side of Fuse 12 (5A).

Is resistance 10,000 ohms or more?

Yes
SERVICE Circuit 640 (R/Y) for short to ground. REPLACE Fuse 12 (5A). RESTORE vehicle. RETEST system.
No
REPLACE damaged Fuse 12 (5A). RESTORE vehicle. RETEST system.