BENDIX BW2771 User Manual download pdf (Page 47)

General Information

Appendix 4D, 4E

Step Procedure

D 1. VehicleIgnition:Key-ON,Engine-OFF.

2. Measure for ignition voltage on pins 10 and 9 on the harness connector.

a. If the voltage is within 0.6 volts of the battery voltage measured in Step A.

i. Proceed to Step E.

b. If voltage is less than 0.6 volts of the battery voltage measured in Step A or open.

    i. TestFailed.Checkcomponentfuse.TroubleshootpowersupplytotheFLRforopen/corroded

connections or shorts to ground and repeat Step.

Verifying Component Power Up Timing

Verify the DIU and FLR are wired to the same ignition source. If either component is wired to a secondary ignition source with a delay, one

of the components may set a Diagnostic Trouble Code (DTC) as a result of the other(s) delayed power cycle.

Step Procedure

E 1. Key-OFF.LetthetrucksitfortwominutestoallowtimefortheECU'stocompletelypowerdown.

2. Disconnect the 10-way connector from the back of the FLR and add a test lamp to ignition power pin 10.

If the test lamp requires a ground pin, use pin 9 or chassis ground.

Be careful not to spread pins on the FLR harness connector while performing this test.

3. Disconnect the 8-way connector from the back of the DIU and add a test lamp to power pin 4. If the test lamp

requires a ground pin, use pin 5 or ground the lamp to chassis ground.

Be careful not to spread pins on the DIU harness connector while performing this test.

4. While viewing both test lamps, turn the ignition key on to verify that both lamps light at the same time.

a. If there is a noticeable delay before one lamp lights, the power source for the delayed light could

be a secondary delayed ignition supply.

i. Correct the wiring by connecting the appropriate component to the main ignition power

supply bus.

b. If the lamps light simultaneously.

i. Test Passed.

5. Test Complete.

CAUTION

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BENDIX BW2771 User Manual Page 47