GMC Repair: 2000 Tahoe Limited Door Locks, power door locks, digital volt meter

Question
I have a 2000 tahoe limited with 5.7 vortec and my power locks are not working could you please help me with any information on the subject.  THANK YOU

Answer
Hi
Here is the EXACT service info from GM.
Please be adviced it is VERY detailed and you'll need a working knowlege of auto electronics.
Igf you DO NOT have knowlege, you CAN seriously damage the wiring systems and or cause yourself harm.
You'll need a test lamp AND a digital Volt Meter.

Definition: This diagnostic should only be used if all door lock motors are inoperative from all switches.


2
Connect a J 35616-200 test lamp between CKT 640 (ORN) at LF door lock switch and ground.

Does test lamp light?
--
Go to Step 3
Go to Step 14

3
Gain access to the Door Lock Relay.
Connect a J 35616-200 test lamp between CKT 540 (ORN) and ground.
Does test lamp light?
--
Go to Step 4
Go to Step 15

4
Connect a J 39200 DMM, set on Ohms, between CKT 150 (BLK) at Door Lock Relay and ground.

Is there continuity?
--
Go to Step 5
Go to Step 16

5
Connect a J 35616-200 test lamp between CKT 294 (TAN) at Door Lock Relay and ground.
Move LF Door Lock Switch to the UNLOCK position.
Does test lamp light?
--
Go to Step 6
Go to Step 9

6
Connect a J 35616-200 test lamp between CKT 295 (GRY) and ground.
Move LF Door Lock Switch to the LOCK position.
Does the test lamp light?
--
Go to Step 7
Go to Step 10

7
Connect a J 39200 DMM, set on Ohms, between CKT 295 (GRY) at Door Lock Relay and ground and CKT 294 (TAN) and ground.

Is there continuity in both positions?
--
Go to Step 8
Go to Step 13

8
Repair open in CKT 294 (TAN) or CKT 295 (GRY) between Door Lock Relay and door lock motors. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?
--
Go to Power Door Locks System Check
--

9
Connect a J 35616-200 test lamp between CKT 194 (WHT) and ground.
Move LF Door Lock Switch to the UNLOCK position.
Does the test lamp light?
--
Go to Step 11
Go to Step 12

10
Connect a J 35616-200 test lamp between CKT 195 (LT BLU) and ground.
Move the LF Door Lock Switch to the lock position.
Does the test lamp light?
--
Go to Step 11
Go to Step 13

11
Replace the Door Lock Relay.

Is the repair complete?
--
Go to Power Door Locks System Check
--

12
Repair open in CKT 194 (WHT) between Door Lock Switches and Door Lock Relay. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?
--
Go to Power Door Locks System Check
--

13
Repair open in CKT 195 (LT BLU) between Door Lock Switches and Door Lock Relay. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?
--
Go to Power Door Locks System Check
--

14
Repair open in CKT 640 (ORN) between I/P Fuse Block and Door Lock Switches. Refer to Wiring Repairs in Wiring Systems.

Do the door locks function properly?
--
Go to Power Door Locks System Check
Go to Step 3

15
Repair open in CKT 540 (ORN) between I/P Fuse Block and Door Lock Relay. Refer to Wiring Repairs in Wiring Systems.

Do the door locks function properly?
--
Go to Power Door Locks System Check
Go to Step 4

16
Repair open in CKT 150 (BLK) between Door Lock Relay and G202. Refer to Wiring Repairs in Wiring Systems.

Do the door locks function properly?
--
Go to Power Door Locks System Check
Go to Step 5

Pawl