Isuzu 1999 RODEO Workshop Manual page 408

Chart A-4 Brake Pedal Feed Is Abnormal
Step
1 Is the stop light actuated when the brake pedal is depressed?
2 1. Turn the ignition switch off.
2. Disconnected EHCU connector.
Is the check voltage EHCU connector terminals 13 to 7 when
brake pedal is depressed than battery voltage?
3 Is stop light fuse normal?
4 Is the check continuity between EHCU connector terminals, 7 to
body grounded?
5 Is brake SW normal?
6 Reconnect all components, ensure all components are properly
mounted.
Was this step finished?
Action
BRAKE CONTROL SYSTEM
Yes
Go to Step 2
Go to Step 4
Replace stop light
Go to Step 5
Go to Step 6
Repair stop light
harness.
Go to Step 6
Repeat the "Basic
diagnostic flow
chart"
5A–33
No
Go to Step 3
Harness NG
between brake
SW and EHCU.
Go to Step 6
fuse.
Go to Step 6
Repair body
grounded
harness.
Go to Step 6
Replace brake
SW.
Go to Step 6
Go to Step 6