TEST UNIT TEST]
must be turned on for all troubleshooting tests to provide power
for test unit. Do not turn ignition switch off during testing.
1. Turn on ignition switch. DO NOT start engine.
2. Press button 1. Check that BREMSLICHT/Brake Light is on. BREMSLICHT/Brake Light will
stay on for remaining tests.
3. Press START TEST button. Digital display must read 1888. If test unit displays a different
number or no number, test unit is defective and must be replaced, or there is an open circuit
in valve relay power supply.
4. Refer to illustration for button identification while performing tests.
Do the ABS troubleshooting tests (Table 3-2) in the order listed. If a fault is found in any
component during the tests, correct the fault, then repeat all tests beginning with TEST UNIT