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Backup Lamps

Inspection and Verification
1. Verify the customer's concern by operating the backup lamps to duplicate the condition.
2. Inspect to determine if one of the following electrical concerns apply:



VISUAL INSPECTION CHART
Electrical
Circuitry open/shorted.
Fuse junction panel Fuse 6 (15A).
Miniature bulb burned out.
Damaged backup lamp switch.

3. If the inspection reveals obvious concern(s) that can be readily identified, service as required.
4. If the concern(s) remains after the inspection, determine the symptom(s) and go to the Symptom Chart.

Symptom Chart—Backup Lamps
Refer to the Electrical and Vacuum Troubleshooting Manual for the connector numbers cited in the pinpoint tests.
Use Rotunda Digital Volt-Ohmmeter 014-00407 or equivalent to perform pinpoint tests.
BACKUP LAMPS
Condition
Possible Source
Action
Backup Lamps Inoperative
Circuitry open/shorted.
Damaged backup lamp switch.
Open fuse.
GO to Pinpoint Test GA .
Individual Backup Lamp Inoperative
Open circuitry.
Burned out miniature bulb.
Damaged connector.
GO to Pinpoint Test GB .
Backup Lamps On Continuously
Circuitry open/shorted.
Damaged backup lamp switch.
GO to Pinpoint Test GC .


PINPOINT TEST GA: BACKUP LAMPS INOPERATIVE

GA1 CHECK SUPPLY AT TRANSMISSION RANGE SENSOR
Turn ignition switch to RUN.
NOTE: Make sure engine is not running.
Access and disconnect transmission range (TR) sensor.
Using a voltmeter connected to a known good ground, check Circuit 1087 (O) for voltage as follows.
3.0L (2V) TR sensor connector Pin C171 .
3.0L (4V) TR sensor connector Pin C107 .
Is B+ present?
Yes
No
GO to GA4 .
GO to GA2 .


GA2 CHECK SUPPLY AT FUSE 6 (15A)
Using a voltmeter, check fuse junction panel connector Pin C107 , Circuit 1087 (O).
Is B+ present?
Yes
No
SERVICE Circuit 1087 (O) for open circuit. RESTORE vehicle. RETEST system.
GO to GA3 .


GA3 CHECK SUPPLY TO FUSE 6 (15A)
Using a voltmeter, check fuse junction panel connector Pin C235 , Circuit 1040 (R/LB).
Is B+ present?
Yes
No
REPLACE damaged Fuse 6 (15A). RESTORE vehicle. RETEST system.
SERVICE Circuit 1040 (R/LB). RESTORE vehicle. RETEST system.


GA4 CHECK SWITCH OUTPUT
Actuate shift lever to the REVERSE position.
Using a voltmeter connected to ground, check TR sensor connector Pin C171 (column shift) or Pin C107 (floor shift), Circuit 140 (BK/PK) for voltage.
Is B+ present?
Yes
No
GO to GA5 .
REPLACE damaged transmission range (TR) sensor. REFER to Section 07-01A (Ax4N) or Section 07-01B (Ax4N). RESTORE vehicle. RETEST system.


GA5 CHECK SUPPLY TO BACKUP LAMPS
Gain access to backup lamps as described.
Disconnect backup lamp bulb.
Using a voltmeter connected to a known good ground, check Circuit 140 (BK/PK) for voltage.
Is B+ present?
Yes
No
GO to GA6 .
SERVICE Circuit 140 (BK/PK) for open circuit. RESTORE vehicle. RETEST system.


GA6 CHECK BACKUP LAMP GROUND
Using an ohmmeter connected to a known good ground, connect second lead to Circuit 57 (BK) at suspect backup lamp socket. Measure resistance.
Is resistance 5 ohms or less?
Yes
No
REPLACE damaged backup lamp bulb. RESTORE vehicle. RETEST system.
SERVICE Circuit 57 (BK) for open circuit. RESTORE vehicle. RETEST system.


PINPOINT TEST GB: INDIVIDUAL BACKUP LAMP INOPERATIVE

GB1 CHECK SUPPLY TO BACKUP LAMP BULB
Turn ignition switch to RUN. Make sure engine is OFF.
Move gearshift lever to reverse.
Access backup lamp connector.
Using a voltmeter connected to a known good ground, connect the other end to Circuit 140 (PK/BK) of suspect backup lamp connector.
Is B+ present?
Yes
No
GO to GB2 .
SERVICE Circuit 140 (PK/BK) for open. RESTORE vehicle. RETEST system.


GB2 CHECK CIRCUIT 57 (BK)
Using an ohmmeter connected to a known good ground, connect the second lead to Circuit 57 (BK) of suspect backup lamp connector.
Is resistance 5 ohms or less?
Yes
No
REPLACE backup lamp bulb. RESTORE vehicle. RETEST system.
SERVICE Circuit 57 (BK) for open. RESTORE vehicle. RETEST system.


PINPOINT TEST GC: BACKUP LAMPS ON CONTINUOUSLY

GC1 CHECK TRANSMISSION RANGE (TR) SENSOR
Access and disconnect transmission range (TR) sensor connector.
Did backup lamps turn off?
Yes
No
REPLACE transmission range sensor. RESTORE vehicle. RETEST system.
SERVICE Circuit 140 (PK/BK) for short to B+. RESTORE vehicle. RETEST system.


 
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