GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2000 🢒 Blazer - 4WD - RHD 🢒 Body and Accessories 🢒 Doors 🢒 Heated Mirrors Inoperative

Step

Action

Value(s)

Yes

No

1

Did you perform the Power Door Systems Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Power Door Systems

2

Verify that the heated mirrors are inoperative.

Do the heated mirrors operate normally?

--

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

Inspect the HTD MIR fuse in the underhood fuse block.

Is the fuse open?

--

Go to Step 4

Go to Step 15

4
  1. Remove the HTD MIR fuse.
  2. Using the J 39200 Digital Multimeter (DMM), connect the load side¹ of the HTD MIR fuse to battery ground.

Is the resistance less than the specified value?

4 ohms

Go to Step 5

Go to Circuit Testing in Wiring Systems

5

Disconnect connector C1 of the underhood fuse block.

Does the resistance equal the specified value?

OL

Go to Step 7

Go to Step 6

6

Replace the underhood fuse block.

Did you complete the repair?

--

Go to Step 24

--

7
  1. Reconnect connector C1 of the underhood fuse block.
  2. Disconnect C601.
  3. Using the J 39200 DMM, connect between the male end of terminal P of C601 to ground.

Is the resistance within the specified range?

8-10 ohms

Go to Step 8

Go to Step 10

8
  1. Disconnect C604.
  2. Using the J 39200 DMM, connect between terminal A and terminal H of the component end of C604.

Is the resistance within the specified range?

8-10 ohms

Go to Step 9

Go to Step 13

9

Repair the short to ground in CKT 2267 between C601 and C604. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 24

--

10
  1. Disconnect C601.
  2. Using the J 39200 DMM, connect between the male end of terminal P of C601 to ground.

Is the resistance within the specified range?

8-10 ohms

Go to Step 11

Go to Step 14

11
  1. Disconnect C504.
  2. Using the J 39200 DMM, connect between terminal A and terminal H of the component end of C604.

Is the resistance within the specified range?

8-10 ohms

Go to Step 12

Go to Step 13

12

Repair the short to ground in CKT 2267 between C601 and C504. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 24

--

13

Replace the heated mirror assembly.

Did you complete the repair?

--

Go to Step 24

--

14

Repair the short to ground in CKT 2267 between underhood fuse block connector C1 and C601. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 24

--

15
  1. Turn the ignition switch to the ON position.
  2. Operate the switches for the following devices:
    3. • The left front power window
    • The right front power window
    • The left front power door lock
    • The right front power door lock
    • The left front power mirror
    • The right front power mirror

Are any of these devices inoperative?

--

Go to Step 16

Go to Step 17

16
    • For the left side, locate and repair the open or high resistance in CKT 1850 and G200 and G201. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
    • For the right side, locate and repair the open or high resistance in CKT 1850 and G204. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 24

--

17
  1. Remove the defogger relay.
  2. Disconnect connector C1 of the underhood fuse block.
  3. Using the J 39200 DMM, connect between the defogger relay terminal 87 and terminal F6 of connector C1 at the underhood fuse block.

Is the resistance less than the specified value?

1 ohms

Go to Step 18

Go to Step 6

18
  1. Connect a fused jumper (10A fuse minimum) between the underhood fuse block harness connector C1 terminal F6 and B+.
  2. Using a test lamp, backprobe terminal A of C504 (left front door) or terminal A of C604 (right front door).

Does the test lamp illuminate?

--

Go to Step 21

Go to Step 19

19

Using a test lamp, backprobe terminal A5 of C501 (left front) or terminal P of C601 (right front) to ground.

Does the test lamp illuminate?

--

Go to Step 21

Go to Step 20

20

Locate and repair the open or high resistance in CKT 2267. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 24

--

21

Using a test lamp, backprobe terminal H of C504 (left side) or terminal H of C604 (right side) to ground.

Does the test lamp illuminate?

--

Go to Step 22

Go to Step 23

22

Locate and repair the open or high resistance in CKT 1850 (left side) or CKT 1850 (right side). Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 24

--

23

Replace the heated mirror assembly (left or right side). Refer to Outside Rearview Mirror Replacement .

Did you complete the repair?

--

Go to Step 24

--

24

Operate the system in order to verify the repair.

Did you find and correct the condition?

--

System OK

Go to Step 3

¹The load side of the fuse is the terminal without battery voltage.