GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1999 🢒 Catera 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Backup Lamps Inoperative

Step

Action

Value(s)

Yes

No

1

Did you perform the Backup Lights Diagnostic System Check?

--

Go to Step 2

Go to Backup Lamp System Check

2
  1. Disconnect the automatic transmission range switch connector.
  2. Turn on the ignition.
  3. Use a DMM in order to measure the voltage between terminal  D of the automatic transmission range switch connector and a known good ground.

Does the voltage measure near the specified value?

B+

Go to Step 4

Go to Step 3

3
  1. Locate an open or a high resistance in CKT X756 and/or CKT X757.
  2. Repair the open or the high resistance in CKT X756 and/or CKT 757.

Did you complete the repair?

--

Go to Step 11

--

4

Connect a fused jumper wire between terminal  D and terminal F of the automatic transmission range switch connector.

Do the backup lamps illuminate?

--

Go to Step 5

Go to Step 6

5

Replace the automatic transmission range switch. Refer to Manual Shift Shaft Position Switch Replacement in Automatic Transmission.

Did you complete the repair?

--

Go to Step 11

--

6
  1. Disconnect the LH backup lamp connector.
  2. Use the DMM in order to measure the voltage between terminal B of the LH backup lamp connector and a known good ground.

Does the voltage measure near the specified value?

B+

Go to Step 8

Go to Step 7

7
  1. Locate an open or a high resistance in circuit MF10 or MF757.
  2. Repair the open or the high resistance in circuits MF10 or MF757.

Did you complete the repair?

--

Go to Step 11

--

8

Use the DMM in order to measure the resistance between terminal A of the LH backup lamp connector and a known good ground.

Does the resistance measure less than the specified value?

5 ohms

Go to Step 10

Go to Step 9

9
  1. Locate an open or a high resistance in CKT F48.
  2. Repair the open or the high resistance in CKT F48.

Did you complete the repair?

--

Go to Step 11

--

10

Replace the LH and/or RH backup lamp. Refer Rear License Lamp Replacement in Lighting Systems.

Did you complete the repair?

--

Go to Step 11

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11
  1. Connect all connectors and components that were previously disconnected.
  2. Verify that the backup lamps operate properly.

Do the backup lamps operate properly?

--

Go to Backup Lamp System Check

Go to Step 1