GM Service Manual Online
For 1990-2009 cars only
Figure 1:

Underhood Electrical Center HORN Relay Circuit Location


Object Number: 74037  Size: LF
Figure 2:

I/P Electrical Center RRDEFOGG Relay Circuit Location


Object Number: 74038  Size: LF
Figure 3:

I/P Electrical Center DRL R Relay Circuit Location


Object Number: 74039  Size: LF
Figure 4:

Underhood Electrical Center BACKUP LP Relay Circuit Location


Object Number: 74040  Size: LF
Figure 5:

I/P Electrical Center DRL L Relay Circuit Location


Object Number: 74041  Size: LF