GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1997 🢒 Corvette 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Inside Rearview Mirror Lamp Inoperative

Rearview mirror lamps inoperative

Step

Action

Value(s)

Yes

No

1

Were you sent here from the Interior Lights Diagnostic System Check?

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Go to Step 2

Go to Interior Lights Diagnostic System Check

2
  1. Connect a DMM between the rearview mirror connector terminal C and ground.
  2. Measure for continuity to ground in the CKT 150.

Is the CKT 150 continuous to ground?

--

Go to Step 4

Go to Step 3

3

Repair CKT 150 for an open or a short to battery voltage.

Is the repair complete?

--

Go to Interior Lights Diagnostic System Check

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4
  1. Connect the DMM between the rearview mirror connector terminal B and ground.
  2. Remove the MONITORED LD Micro Relay #37 from the Instrument Panel Electrical Center.
  3. Connect a fuse jumper between pins 30 and 87 of the Instrument Panel Electrical Center.
  4. Measure the available voltage at the connector.

Is the measured voltage within the specified value?

10.0-14.0V

Go to Step 5

Go to Step 6

5
  1. Connect the DMM between the rearview mirror connector terminal A and ground.
  2. Remove the CTSY LP Micro Relay #42 from the Instrument Panel Electrical Center.
  3. Connect a fuse jumper between pins 30 and 87 of the Instrument Panel Electrical Center.
  4. Measure the available voltage at the connector.

Is the measured voltage within the specified value?

10.0-14.0V

Go to Step 12

Go to Step 9

6

Check the MONITORED LD MiniFuse ® #2 for an open.

Is the fuse open?

--

Go to Step 7

Go to Step 8

7

Repair CKT 640 for a short to ground.

Is the repair complete?

--

Go to Interior Lights Diagnostic System Check

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8

Repair CKT 640 for an open.

Is the repair complete?

--

Go to Interior Lights Diagnostic System Check

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9

Check the C/LALDL MiniFuse ® #29 for an open.

Is the fuse open?

--

Go to Step 10

Go to Step 11

10

Repair CKT 740 for a short to ground.

Is the repair complete?

--

Go to Interior Lights Diagnostic System Check

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11

Repair CKT 740 for an open.

Is the repair complete?

--

Go to Interior Lights Diagnostic System Check

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12

Replace the rear courtesy lamp.

Is the repair complete?

--

Go to Interior Lights Diagnostic System Check

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