Circuit/System Testing

Test 1

1. Ignition/Vehicle & All vehicle systems » Off
2. Disconnect the appropriate electrical connector:
   • A23D Door Latch Assembly - Driver
   • A23LR Door Latch Assembly - Left Rear
   • A23P Door Latch Assembly - Passenger
   • A23RR Door Latch Assembly - Right Rear
3. Connect a test lamp between the test points:
   • A23D Door Latch Assembly - Driver: Control circuit terminal 6 & Control circuit terminal 8
   • A23P Door Latch Assembly - Passenger: Control circuit terminal 10 & Control circuit terminal 8
   • A23LR Door Latch Assembly - Left Rear: Control circuit terminal 6 & Control circuit terminal 8
   • A23RR Door Latch Assembly - Right Rear: Control circuit terminal 10 & Control circuit terminal 8
4. Ignition » On / Vehicle » In Service Mode
5. Perform the scan tool control function: Door Dead Lock Lock/Unlock » Lock & Unlock
6. Verify the test lamp does not turn On and Off.
   • If the test lamp turns On and Off 

     Test or replace the component: A23 Door Latch Assembly

   • If the test lamp does not turn On and Off 
7. Ignition/Vehicle » Off
8. Disconnect the electrical connector: X6 at K9 Body Control Module
9. Disconnect the electrical connector: X3 at X53A Fuse Block - Rear Body
10. Test for less than 2 Ω between the test points:
    • Control circuit terminal 8 at A23D Door Latch Assembly - Driver & Control circuit terminal 4 X6 at Control module harness
    • Control circuit terminal 8 at A23LR Door Latch Assembly - Left Rear & Control circuit terminal 4 X6 at Control module harness
    • Control circuit terminal 8 at A23P Door Latch Assembly - Passenger & Control circuit terminal 4 X6 at Control module harness
    • Control circuit terminal 8 at A23RR Door Latch Assembly - Right Rear & Control circuit terminal 4 X6 at Control module harness
    • Control circuit terminal 10 at A23P Door Latch Assembly - Passenger & Control circuit terminal 17 X3 at Fuse Block Harness
    • Control circuit terminal 10 at A23RR Door Latch Assembly - Right Rear & Control circuit terminal 17 X3 at Fuse Block Harness
    • Control circuit terminal 6 at A23D Door Latch Assembly - Driver & Control circuit terminal 17 X3 at Fuse Block Harness
    • Control circuit terminal 6 at A23LR Door Latch Assembly - Left Rear & Control circuit terminal 17 X3 at Fuse Block Harness
    • If 2 Ω or greater » Repair the open/high resistance in the circuit.
    • If less than 2 Ω 
11. Test or replace the component: K9 Body Control Module

Test 2

NOTE:

It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

1. Ignition/Vehicle & All vehicle systems » Off
2. Disconnect the electrical connector: X2 at X53A Fuse Block - Rear Body
3. Test for less than 10 Ω between the test points: Ground circuit terminal 27 & Ground
   • If 10 Ω or greater 
   1. Ground Connection » Disconnect
   2. Test for less than 2 Ω between the test points: Ground circuit terminal 27 & Ground Connection
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » Repair the open/high resistance in the ground connection.
   • If less than 10 Ω 
4. Connect the electrical connector: X2 at X53A Fuse Block - Rear Body
5. Disconnect the electrical connector: X7 at K9 Body Control Module
6. Ignition » On / Vehicle » In Service Mode
7. Momentarily connect a 3 A fused jumper wire between the test points: Control circuit terminal 10 & B+

   Verify the component produces a clicking sound: A23D Door Latch Assembly - Driver

   • If the component does not produce a sound 
   1. Ignition/Vehicle » Off & Remove » Jumper wire(s)
   2. Disconnect the electrical connector: X2 at X53A Fuse Block - Rear Body
   3. Ignition » On / Vehicle » In Service Mode
   4. Test for less than 1 V between the test points: Control circuit terminal 10 at Control module harness & Ground
      • If 1 V or greater » Repair the short to voltage on the circuit.
      • If less than 1 V
   5. Ignition/Vehicle » Off
   6. Test for infinite resistance between the test points: Control circuit terminal 10 at Control module harness & Ground
      • If less than infinite resistance » Repair the short to ground on the circuit.
      • If infinite resistance
   7. Test for less than 2 Ω between the test points: Control circuit terminal 10 at Control module harness & Control circuit terminal 32 X2 at Fuse Block Harness
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » Test or replace the component: X53A Fuse Block - Rear Body
   • If the component turns On and Off 
8. Replace the component: K9 Body Control Module