A4 Diode Resistor Element, Circuit 531

- Disconnect fluid level switch.

- Connect jumper wire from Circuit 531 (DG/Y) to known chassis ground.

- Observe brake warning light.

- Does the brake warning light function?

YES -- Leave fluid level switch disconnected. Go to A5. A5 Master Cylinder Fluid Level Switch

NO -- Repair open Circuit 977 (P/W), 531 (DG/Y) or open diode/resistor element. Repeat System Pre-Check. Inspection and Verification (Start Testing Here)